CVE-2021-23000: f5 big-ip_access_policy_manager
Vulnerability summary
CVE-2021-23000 is a high (CVSS 7.5) vulnerability in f5 big-ip_access_policy_manager. EPSS estimates a 0.93% chance of exploitation in the next 30 days, higher than 60% of scored vulnerabilities.
Timeline
- 31-03-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
0.93%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
0.00 pp
From 0.93% 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
F514 products
- big-ip_access_policy_manager≥ 13.1.3.4, < 13.1.3.6 | 12.1.5.2
- big-ip_advanced_firewall_manager≥ 13.1.3.4, < 13.1.3.6 | 12.1.5.2
- big-ip_advanced_web_application_firewall≥ 13.1.3.4, < 13.1.3.6 | 12.1.5.2
- big-ip_analytics≥ 13.1.3.4, < 13.1.3.6 | 12.1.5.2
- big-ip_application_acceleration_manager≥ 13.1.3.4, < 13.1.3.6 | 12.1.5.2
1 vendor · 14 products