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CVE-2019-11043 · CVE record: PUBLISHED

Underflow in PHP-FPM can lead to RCE

PHP PHP

In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it is possible to cause FPM module to write past allocated buffers into the space reserved for FCGI protocol data, thus opening the possibility of remote code execution.

Exploitation evidence

Known exploited · CISA KEV listed

Added 2022-03-25. Ransomware campaign use: Known.

CISA required action: Apply updates per vendor instructions.

CISA due date: 2022-04-15. 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

PHP / PHP

Default status: Not specified

affected: 7.1.x to < 7.1.33 (custom)
affected: 7.2.x to < 7.2.24 (custom)
affected: 7.3.x to < 7.3.11 (custom)

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.

Reported workarounds: Configuring nginx (or other server that implements the front-end part of the FPM protocol) to check for the existence of the target file before passing it to PHP FPM (e.g. "try_files $uri =404" or "if (-f $uri)" in nginx) for would prevent this vulnerability from happening.

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": 0.99783,
  "percentile": 0.99956
}

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

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-10",
  "epss": 0.99783,
  "percentile": 0.99956
}

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

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-09",
  "epss": 0.99783,
  "percentile": 0.99955
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08 Nov 2026, 18:20 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-08",
  "epss": 0.99783,
  "percentile": 0.99955
}

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

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-07",
  "epss": 0.99783,
  "percentile": 0.99955
}

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

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-06",
  "epss": 0.99783,
  "percentile": 0.99956
}

06 Nov 2026, 12:20 Jerusalem · CVE Program record changed

Stored CNA snapshot at this observation.

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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-120 Buffer Overflow"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/neex/phuip-fpizdam",
              "refsource": "MISC",
              "url": "https://github.com/neex/phuip-fpizdam"
            },
            {
              "name": "https://bugs.php.net/bug.php?id=78599",
              "refsource": "CONFIRM",
              "url": "https://bugs.php.net/bug.php?id=78599"
            },
            {
              "name": "USN-4166-1",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/4166-1/"
            },
            {
              "name": "DSA-4552",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2019/dsa-4552"
            },
            {
              "name": "DSA-4553",
              "refsource": "DEBIAN",
              "url": "https://www.debian.org/security/2019/dsa-4553"
            },
            {
              "name": "USN-4166-2",
              "refsource": "UBUNTU",
              "url": "https://usn.ubuntu.com/4166-2/"
            },
            {
              "name": "https://support.f5.com/csp/article/K75408500?utm_source=f5support&amp;utm_medium=RSS",
              "refsource": "CONFIRM",
              "url": "https://support.f5.com/csp/article/K75408500?utm_source=f5support&amp;utm_medium=RSS"
            },
            {
              "name": "FEDORA-2019-4adc49a476",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T62LF4ZWVV7OMMIZFO6IFO5QLZKK7YRD/"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20191031-0003/",
              "refsource": "CONFIRM",
              "url": "https://security.netapp.com/advisory/ntap-20191031-0003/"
            },
            {
              "name": "RHSA-2019:3286",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3286"
            },
            {
              "name": "RHSA-2019:3287",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3287"
            },
            {
              "name": "RHSA-2019:3299",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3299"
            },
            {
              "name": "RHSA-2019:3300",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3300"
            },
            {
              "name": "FEDORA-2019-187ae3128d",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3W23TP6X4H7LB645FYZLUPNIRD5W3EPU/"
            },
            {
              "name": "FEDORA-2019-7bb07c3b02",
              "refsource": "FEDORA",
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FSNBUSPKMLUHHOADROKNG5GDWDCRHT5M/"
            },
            {
              "name": "openSUSE-SU-2019:2441",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00011.html"
            },
            {
              "name": "RHSA-2019:3724",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3724"
            },
            {
              "name": "RHSA-2019:3735",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3735"
            },
            {
              "name": "RHSA-2019:3736",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2019:3736"
            },
            {
              "name": "https://www.synology.com/security/advisory/Synology_SA_19_36",
              "refsource": "CONFIRM",
              "url": "https://www.synology.com/security/advisory/Synology_SA_19_36"
            },
            {
              "name": "openSUSE-SU-2019:2457",
              "refsource": "SUSE",
              "url": "http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00014.html"
            },
            {
              "name": "https://support.apple.com/kb/HT210919",
              "refsource": "CONFIRM",
              "url": "https://support.apple.com/kb/HT210919"
            },
            {
              "name": "20200129 APPLE-SA-2020-1-28-2 macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra",
              "refsource": "BUGTRAQ",
              "url": "https://seclists.org/bugtraq/2020/Jan/44"
            },
            {
              "name": "20200131 APPLE-SA-2020-1-28-2 macOS Catalina 10.15.3, Security Update 2020-001 Mojave, Security Update 2020-001 High Sierra",
              "refsource": "FULLDISC",
              "url": "http://seclists.org/fulldisclosure/2020/Jan/40"
            },
            {
              "name": "RHSA-2020:0322",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2020:0322"
            },
            {
              "name": "http://packetstormsecurity.com/files/156642/PHP-FPM-7.x-Remote-Code-Execution.html",
              "refsource": "MISC",
              "url": "http://packetstormsecurity.com/files/156642/PHP-FPM-7.x-Remote-Code-Execution.html"
            },
            {
              "name": "https://www.tenable.com/security/tns-2021-14",
              "refsource": "CONFIRM",
              "url": "https://www.tenable.com/security/tns-2021-14"
            }
          ]
        },
        "source": {
          "defect": [
            "https://bugs.php.net/bug.php?id=78599"
          ],
          "discovery": "EXTERNAL"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "Configuring nginx (or other server that implements the front-end part of the FPM protocol) to check for the existence of the target file before passing it to PHP FPM (e.g. \"try_files $uri =404\" or \"if (-f $uri)\" in nginx) for would prevent this vulnerability from happening."
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b",
    "assignerShortName": "php",
    "cveId": "CVE-2019-11043",
    "datePublished": "2019-10-28T14:19:04.252Z",
    "dateReserved": "2019-04-09T00:00:00.000Z",
    "dateUpdated": "2025-10-21T23:45:28.408Z",
    "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": 0.99783,
  "percentile": 0.99956
}

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

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-04",
  "epss": 0.99783,
  "percentile": 0.99956
}

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

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-03",
  "epss": 0.99783,
  "percentile": 0.99956
}

03 Nov 2026, 02:22 Jerusalem · EPSS observation updated

Stored EPSS snapshot at this observation.

{
  "date": "2026-11-02",
  "epss": 0.99783,
  "percentile": 0.99956
}

03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed

Stored KEV snapshot at this observation.

{
  "cveID": "CVE-2019-11043",
  "cwes": [
    "CWE-120"
  ],
  "dateAdded": "2022-03-25",
  "dueDate": "2022-04-15",
  "forensicTriage": "No",
  "knownRansomwareCampaignUse": "Known",
  "notes": "https://nvd.nist.gov/vuln/detail/CVE-2019-11043",
  "product": "FastCGI Process Manager (FPM)",
  "requiredAction": "Apply updates per vendor instructions.",
  "shortDescription": "In some versions of PHP in certain configurations of FPM setup, it is possible to cause FPM module to write past allocated buffers allowing the possibility of remote code execution.",
  "vendorProject": "PHP",
  "vulnerabilityName": "PHP FastCGI Process Manager (FPM) Buffer Overflow Vulnerability"
}

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