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CVE-2021-22893

CRITICAL
10
CVSS Score
Published: April 23, 2021 at 04:29 PM UTC
Updated: August 12, 2026 at 05:28 AM UTC
2 products affected across 2 vendorsConnect SecurePulse Connect Secure

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Severity
CRITICAL10
Exploitation
CISA KEV
Exploit prediction
EPSS 47%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score47.2%

EPSS (Exploit Prediction Scoring System) estimates a 47.2% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Ivanti Pulse Connect Secure contains a use-after-free vulnerability that allow a remote, unauthenticated attacker to execute code via license services.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Known
Added to KEV
Nov 3, 2021
Remediation Due
May 3, 2022
1640 days overdue
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

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (6)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://blog.pulsesecure.net/pulse-connect-secure-security-update/
x_refsource_MISCThird Party AdvisoryUS Government Resource
Source: [email protected]
https://kb.cert.org/vuls/id/213092
x_refsource_MISCBroken LinkVendor Advisory
Source: [email protected]
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html
US Government Resource
Source: af854a3a-2127-422b-91ae-364da2661108
https://www.kb.cert.org/vuls/id/213092
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22893

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

10CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-287CWE-416

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