CVE-2021-22976: f5 big-ip_advanced_web_application_firewall
Vulnerability summary
CVE-2021-22976 is a high (CVSS 7.5) vulnerability in f5 big-ip_advanced_web_application_firewall. EPSS estimates a 1.00% chance of exploitation in the next 30 days, higher than 62% of scored vulnerabilities.
Timeline
- 12-02-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
On BIG-IP Advanced WAF and ASM version 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.6, and all 12.1.x versions, when the BIG-IP ASM system processes WebSocket requests with JSON payloads, an unusually large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd process. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
1.00%
Chance of exploitation in the next 30 days
Percentile
62%
Versus all other CVEs
30-day change
0.00 pp
From 1.00% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
F52 products
- big-ip_advanced_web_application_firewall≥ 12.1.0, ≤ 12.1.5 | ≥ 13.1.0, < 13.1.3.6 | ≥ 14.1.0, < 14.1.3.1 | ≥ 15.1.0, < 15.1.2 | ≥ 16.0.0, < 16.0.1.1
- big-ip_application_security_manager≥ 12.1.0, ≤ 12.1.5 | ≥ 13.1.0, < 13.1.3.6 | ≥ 14.1.0, < 14.1.3.1 | ≥ 15.1.0, < 15.1.2 | ≥ 16.0.0, < 16.0.1.1
1 vendor · 2 products