November 13, 2026 Follow Egret
CVE-2019-16928 · CVE record: PUBLISHED

Exim Out-of-bounds Write Vulnerability

n/a n/a

Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command.

Exploitation evidence

Known exploited · CISA KEV listed

Added 2022-03-03. Ransomware campaign use: Unknown.

CISA required action: Apply updates per vendor instructions.

CISA due date: 2022-03-17. This is the catalog’s deadline, not an assessment of your organization’s exposure.

KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗

Reported products and versions

n/a / n/a

Default status: Not specified

  • affected: n/a

Fixes and workarounds

No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.

Sources and related reporting

CVE Program record ↗ · Download tracked evidence as JSON

Observed change timeline

History begins when Egret first downloads each source. It is not the complete upstream CVE history.

12 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-12",
  "epss": 0.41638,
  "percentile": 0.98702
}
10 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-10",
  "epss": 0.41638,
  "percentile": 0.98694
}
09 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-09",
  "epss": 0.41638,
  "percentile": 0.98692
}
08 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-08",
  "epss": 0.41638,
  "percentile": 0.98692
}
07 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-07",
  "epss": 0.41638,
  "percentile": 0.98691
}
06 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-06",
  "epss": 0.41638,
  "percentile": 0.98689
}
06 Nov 2026, 12:20 Jerusalem · CVE Program record changed

Stored CNA snapshot at this observation.

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T01:24:48.568Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://bugs.exim.org/show_bug.cgi?id=2449"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f"
          },
          {
            "name": "[oss-security] 20190928 Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2019/09/28/1"
          },
          {
            "name": "[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2019/09/28/2"
          },
          {
            "name": "[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2019/09/28/3"
          },
          {
            "name": "DSA-4536",
            "tags": [
              "vendor-advisory",
              "x_refsource_DEBIAN",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2019/dsa-4536"
          },
          {
            "name": "USN-4141-1",
            "tags": [
              "vendor-advisory",
              "x_refsource_UBUNTU",
              "x_transferred"
            ],
            "url": "https://usn.ubuntu.com/4141-1/"
          },
          {
            "name": "[oss-security] 20190929 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
            "tags": [
              "mailing-list",
              "x_refsource_MLIST",
              "x_transferred"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2019/09/28/4"
          },
          {
            "name": "20190929 [SECURITY] [DSA 4536-1] exim4 security update",
            "tags": [
              "mailing-list",
              "x_refsource_BUGTRAQ",
              "x_transferred"
            ],
            "url": "https://seclists.org/bugtraq/2019/Sep/60"
          },
          {
            "name": "FEDORA-2019-006dfc94cd",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/"
          },
          {
            "name": "FEDORA-2019-e080507ba5",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/"
          },
          {
            "name": "FEDORA-2019-d778bd4137",
            "tags": [
              "vendor-advisory",
              "x_refsource_FEDORA",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/"
          },
          {
            "name": "GLSA-202003-47",
            "tags": [
              "vendor-advisory",
              "x_refsource_GENTOO",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202003-47"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2019-16928",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-04T20:03:35.553352Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2022-03-03",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-16928"
              },
              "type": "kev"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-787",
                "description": "CWE-787 Out-of-bounds Write",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-21T23:45:29.725Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-16928"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2022-03-03T00:00:00.000Z",
            "value": "CVE-2019-16928 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-03-20T20:06:16.000Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://bugs.exim.org/show_bug.cgi?id=2449"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f"
        },
        {
          "name": "[oss-security] 20190928 Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2019/09/28/1"
        },
        {
          "name": "[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2019/09/28/2"
        },
        {
          "name": "[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2019/09/28/3"
        },
        {
          "name": "DSA-4536",
          "tags": [
            "vendor-advisory",
            "x_refsource_DEBIAN"
          ],
          "url": "https://www.debian.org/security/2019/dsa-4536"
        },
        {
          "name": "USN-4141-1",
          "tags": [
            "vendor-advisory",
            "x_refsource_UBUNTU"
          ],
          "url": "https://usn.ubuntu.com/4141-1/"
        },
        {
          "name": "[oss-security] 20190929 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
          "tags": [
            "mailing-list",
            "x_refsource_MLIST"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2019/09/28/4"
        },
        {
          "name": "20190929 [SECURITY] [DSA 4536-1] exim4 security update",
          "tags": [
            "mailing-list",
            "x_refsource_BUGTRAQ"
          ],
          "url": "https://seclists.org/bugtraq/2019/Sep/60"
        },
        {
          "name": "FEDORA-2019-006dfc94cd",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/"
        },
        {
          "name": "FEDORA-2019-e080507ba5",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/"
        },
        {
          "name": "FEDORA-2019-d778bd4137",
          "tags": [
            "vendor-advisory",
            "x_refsource_FEDORA"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/"
        },
        {
          "name": "GLSA-202003-47",
          "tags": [
            "vendor-advisory",
            "x_refsource_GENTOO"
          ],
          "url": "https://security.gentoo.org/glsa/202003-47"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2019-16928",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "Exim 4.92 through 4.92.2 allows remote code execution, a different vulnerability than CVE-2019-15846. There is a heap-based buffer overflow in string_vformat in string.c involving a long EHLO command."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html",
              "refsource": "MISC",
              "url": "https://lists.exim.org/lurker/message/20190927.032457.c1044d4c.en.html"
            },
            {
              "name": "https://bugs.exim.org/show_bug.cgi?id=2449",
              "refsource": "MISC",
              "url": "https://bugs.exim.org/show_bug.cgi?id=2449"
            },
            {
              "name": "https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f",
              "refsource": "MISC",
              "url": "https://git.exim.org/exim.git/commit/478effbfd9c3cc5a627fc671d4bf94d13670d65f"
            },
            {
              "name": "[oss-security] 20190928 Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2019/09/28/1"
            },
            {
              "name": "[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2019/09/28/2"
            },
            {
              "name": "[oss-security] 20190928 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2019/09/28/3"
            },
            {
              "name": "DSA-4536",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2019/dsa-4536"
            },
            {
              "name": "USN-4141-1",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/4141-1/"
            },
            {
              "name": "[oss-security] 20190929 Re: Exim CVE-2019-16928 RCE using a heap-based buffer overflow",
              "refsource": "MLIST",
              "url": "http://www.openwall.com/lists/oss-security/2019/09/28/4"
            },
            {
              "name": "20190929 [SECURITY] [DSA 4536-1] exim4 security update",
              "refsource": "BUGTRAQ",
              "url": "https://seclists.org/bugtraq/2019/Sep/60"
            },
            {
              "name": "FEDORA-2019-006dfc94cd",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T3TJW4HPYH3O5HZCWGD6NSHTEBTTAPDC/"
            },
            {
              "name": "FEDORA-2019-e080507ba5",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UY6HPRW7MR3KBQ5JFHH6OXM7YCZBJCOB/"
            },
            {
              "name": "FEDORA-2019-d778bd4137",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EED7HM3MFIBAP5OIMJAFJ35JAJABTVSC/"
            },
            {
              "name": "GLSA-202003-47",
              "refsource": "GENTOO",
              "url": "https://security.gentoo.org/glsa/202003-47"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2019-16928",
    "datePublished": "2019-09-27T20:07:12.000Z",
    "dateReserved": "2019-09-27T00:00:00.000Z",
    "dateUpdated": "2025-10-21T23:45:29.725Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}
05 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-05",
  "epss": 0.41638,
  "percentile": 0.98687
}
04 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-04",
  "epss": 0.41638,
  "percentile": 0.98686
}
03 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-03",
  "epss": 0.41638,
  "percentile": 0.98684
}
03 Nov 2026, 02:22 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-02",
  "epss": 0.41638,
  "percentile": 0.98683
}
03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed

Stored KEV snapshot at this observation.

{
  "cveID": "CVE-2019-16928",
  "cwes": [
    "CWE-787"
  ],
  "dateAdded": "2022-03-03",
  "dueDate": "2022-03-17",
  "forensicTriage": "No",
  "knownRansomwareCampaignUse": "Unknown",
  "notes": "https://nvd.nist.gov/vuln/detail/CVE-2019-16928",
  "product": "Exim Internet Mailer",
  "requiredAction": "Apply updates per vendor instructions.",
  "shortDescription": "Exim contains an out-of-bounds write vulnerability which can allow for remote code execution.",
  "vendorProject": "Exim",
  "vulnerabilityName": "Exim Out-of-bounds Write Vulnerability"
}
Egret — Back to top Egret