UpHeron
All vulnerabilities

Servers and applications

CVE-2021-23000

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)…

Severity
High 7.5
Published
31 Mar 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
13.1.3.6
Sources
NVD

Affected software

SoftwareAffected versions
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_access_policy_manager
  • Version 12.1.5.2
  • From 13.1.3.4 before 13.1.3.6
F5 BIG-IPServers and applications · cpe:a:f5:big-ip_local_traffic_manager
  • Version 12.1.5.2
  • From 13.1.3.4 before 13.1.3.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-23000
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-23000