CVE-2026-40435

BIG-IP httpd access control vulnerability

State: Published
Severity: 6.9 Medium
Published: May 13, 2026
Updated: May 13, 2026
Reserved: Apr 30, 2026

Description

When configured, IP-based access restrictions for httpd do not cover all endpoints, which may allow connections from blocked addresses. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	f5
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	f5

Weaknesses

CWE-420 Unprotected Alternate Channel

Affected Products

Product	Versions
BIG-IPF5	21.0.0 and laterNot affected 17.5.0 to before 17.5.1.4Affected 17.1.0 to before 17.1.3.1Affected 16.1.0 and laterAffected

References

https://my.f5.com/manage/s/article/K000156604vendor-advisorypatch

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