CVE-2021-23009: f5 big-ip_access_policy_manager Infinite Loop
Vulnerability summary
CVE-2021-23009 is a high (CVSS 7.5) Infinite Loop vulnerability in f5 big-ip_access_policy_manager. EPSS estimates a 0.99% chance of exploitation in the next 30 days, higher than 61.8% of scored vulnerabilities.
Timeline
- 10-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted. There is no control plane exposure, this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
0.99%
Chance of exploitation in the next 30 days
Percentile
62%
Versus all other CVEs
30-day change
0.00 pp
From 0.99% 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 causeAffected systems
F514 products
- big-ip_access_policy_manager≥ 15.1.0, < 15.1.3 | ≥ 16.0.0, < 16.0.1.1
- big-ip_advanced_firewall_manager≥ 15.1.0, < 15.1.3 | ≥ 16.0.0, < 16.0.1.1
- big-ip_advanced_web_application_firewall≥ 15.1.0, < 15.1.3 | ≥ 16.0.0, < 16.0.1.1
- big-ip_analytics≥ 15.1.0, < 15.1.3 | ≥ 16.0.0, < 16.0.1.1
- big-ip_application_acceleration_manager≥ 15.1.0, < 15.1.3 | ≥ 16.0.0, < 16.0.1.1
1 vendor · 14 products