CVE-2021-23000

HIGH

F5 BIG-IP 13.1.3.4-13.1.3.6 - Denial of Service via Malicious HTTP Request Sequence

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References
Vendor Advisory x_refsource_misc
https://support.f5.com/csp/article/K34441555

Scores

CVSS v3 7.5
EPSS 0.0065
EPSS Percentile 71.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

Status published
Products (28)
f5/big-ip_access_policy_manager 12.1.5.2
f5/big-ip_access_policy_manager 13.1.3.4 - 13.1.3.6
f5/big-ip_advanced_firewall_manager 12.1.5.2
f5/big-ip_advanced_firewall_manager 13.1.3.4 - 13.1.3.6
f5/big-ip_advanced_web_application_firewall 12.1.5.2
f5/big-ip_advanced_web_application_firewall 13.1.3.4 - 13.1.3.6
f5/big-ip_analytics 12.1.5.2
f5/big-ip_analytics 13.1.3.4 - 13.1.3.6
f5/big-ip_application_acceleration_manager 12.1.5.2
f5/big-ip_application_acceleration_manager 13.1.3.4 - 13.1.3.6
... and 18 more
Published Mar 31, 2021
Tracked Since Feb 18, 2026