Exploitation evidence
Known exploited · CISA KEV listed
Added 2021-11-03. Ransomware campaign use: Known.
CISA required action: Apply updates per vendor instructions.
CISA due date: 2022-05-03. 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 / Pulse Connect Secure
Default status: Not specified
- affected: PCS 9.0R3 or above, PCS 9.1R1 and above
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
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/
- https://blog.pulsesecure.net/pulse-connect-secure-security-update/
- https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html
- https://kb.cert.org/vuls/id/213092
- https://www.kb.cert.org/vuls/id/213092
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22893
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": 0.47508,
"percentile": 0.98861
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.47508,
"percentile": 0.98853
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.47508,
"percentile": 0.98851
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.47508,
"percentile": 0.98851
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.47508,
"percentile": 0.9885
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.47172,
"percentile": 0.98841
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.47172,
"percentile": 0.9884
}06 Nov 2026, 00:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-03T18:58:24.775Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "https://www.kb.cert.org/vuls/id/213092"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://blog.pulsesecure.net/pulse-connect-secure-security-update/"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://kb.cert.org/vuls/id/213092"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 10,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2021-22893",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2021-04-20T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22893"
},
"type": "kev"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-12T03:55:19.358Z",
"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-2021-22893"
}
],
"timeline": [
{
"lang": "en",
"time": "2021-11-03T00:00:00.000Z",
"value": "CVE-2021-22893 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "Pulse Connect Secure",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "PCS 9.0R3 or above, PCS 9.1R1 and above"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the Windows File Share Browser and Pulse Secure Collaboration features of Pulse Connect Secure that can allow an unauthenticated user to perform remote arbitrary code execution on the Pulse Connect Secure gateway. This vulnerability has been exploited in the wild."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-287",
"description": "Improper Authentication - Generic (CWE-287)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2021-04-23T16:29:43.000Z",
"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"shortName": "hackerone"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://blog.pulsesecure.net/pulse-connect-secure-security-update/"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://kb.cert.org/vuls/id/213092"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "support@hackerone.com",
"ID": "CVE-2021-22893",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Pulse Connect Secure",
"version": {
"version_data": [
{
"version_value": "PCS 9.0R3 or above, PCS 9.1R1 and above"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "Pulse Connect Secure 9.0R3/9.1R1 and higher is vulnerable to an authentication bypass vulnerability exposed by the Windows File Share Browser and Pulse Secure Collaboration features of Pulse Connect Secure that can allow an unauthenticated user to perform remote arbitrary code execution on the Pulse Connect Secure gateway. This vulnerability has been exploited in the wild."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "Improper Authentication - Generic (CWE-287)"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/",
"refsource": "MISC",
"url": "https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/"
},
{
"name": "https://blog.pulsesecure.net/pulse-connect-secure-security-update/",
"refsource": "MISC",
"url": "https://blog.pulsesecure.net/pulse-connect-secure-security-update/"
},
{
"name": "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html",
"refsource": "MISC",
"url": "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
},
{
"name": "https://kb.cert.org/vuls/id/213092",
"refsource": "MISC",
"url": "https://kb.cert.org/vuls/id/213092"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"assignerShortName": "hackerone",
"cveId": "CVE-2021-22893",
"datePublished": "2021-04-23T16:29:43.000Z",
"dateReserved": "2021-01-06T00:00:00.000Z",
"dateUpdated": "2026-08-12T03:55:19.358Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.47172,
"percentile": 0.98839
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.47172,
"percentile": 0.98837
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.47172,
"percentile": 0.98836
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2021-22893",
"cwes": [
"CWE-287"
],
"dateAdded": "2021-11-03",
"dueDate": "2022-05-03",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "Reference CISA's ED 21-03 (https://www.cisa.gov/news-events/directives/ed-21-03-mitigate-pulse-connect-secure-product-vulnerabilities) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 21-03. https://nvd.nist.gov/vuln/detail/CVE-2021-22893",
"product": "Pulse Connect Secure",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "Ivanti Pulse Connect Secure contains a use-after-free vulnerability that allow a remote, unauthenticated attacker to execute code via license services.",
"vendorProject": "Ivanti",
"vulnerabilityName": "Ivanti Pulse Connect Secure Use-After-Free Vulnerability"
}