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CVE-2021-22992

71
FAUCET Score

CVE-2021-22992 is a critical buffer overflow vulnerability affecting multiple versions of F5 BIG-IP Advanced WAF/BIG-IP ASM virtual servers. An unauthenticated attacker can trigger this vulnerability with a specially crafted HTTP response to a virtual server configured with a Login Page, potentially leading to a Denial of Service (DoS) attack. In certain scenarios, this flaw could also allow for remote code execution (RCE), resulting in complete system compromise. With a CVSS score of 9.8 (Critical) and a FAUCET Risk Score of 95/100, this vulnerability poses a significant threat. While there is no public exploit code available in Metasploit, Nuclei, or ExploitDB, the vulnerability has garnered substantial community discussion and media coverage, indicating high awareness.

Impacted Technologies

VendorProductVersion(s)CPE
>= 11.6.1, < 11.6.5.3CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
>= 12.1.0, < 12.1.5.3CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
>= 13.1.0, < 13.1.3.6CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
>= 14.1.0, < 14.1.4CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
>= 15.1.0, < 15.1.2.1CPE matchmatch criteria
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
72.71%
Probability of exploitation in next 30 days
EPSS Percentile
99.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.7271 is in the 98th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

support.f5.com / csp/article/K52510511
Vendor Advisory