CVE-2021-23000

high-risk
Published 2021-03-31

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.

Do I need to act?

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0.65% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

F5

References (2)

Vendor Advisory https://support.f5.com/csp/article/K34441555
Vendor Advisory https://support.f5.com/csp/article/K34441555
50
/ 100
high-risk
Severity 26/34 · High
Exploitability 2/34 · Minimal
Exposure 22/34 · High