CVE-2021-22893

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2021-11-03. Federal remediation due 2022-05-03.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

47.17% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 98.7% of scored records. A rank, not a probability.

NVD base score

10.0 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-08-12.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-04-23 16:29Z5 YR AGO

Last updated

2026-08-12 03:55Z23 DAYS AGO

Reserved

2021-01-06

Assigning CNA

hackerone

Record state

PUBLISHED

Severity

Critical (CVSS 10.0)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weaknesses

• CWE-287Improper AuthenticationClass
• CWE-416Use After FreeVariant

Data version

5.2

Document digest

7a908cd7b35bf77c5184f19e1f3070cb38bffbe0e49664f0407a895605b36f7a

• kb.pulsesecure.nethttps://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44784/x_refsource_MISC
• blog.pulsesecure.nethttps://blog.pulsesecure.net/pulse-connect-secure-security-update/x_refsource_MISC
• www.fireeye.comhttps://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.htmlx_refsource_MISC
• kb.cert.orghttps://kb.cert.org/vuls/id/213092x_refsource_MISC
• www.kb.cert.orghttps://www.kb.cert.org/vuls/id/213092
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22893government-resource