CVE-2026-40435

MEDIUM

F5 BIG-IP httpd - Access Control Bypass

Title source: manual
STIX 2.1

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.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
https://my.f5.com/manage/s/article/K000156604

Scores

CVSS v3 5.3
EPSS 0.0006
EPSS Percentile 19.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-420
Status published
Products (4)
F5/BIG-IP 16.1.0
F5/BIG-IP 17.1.0 - 17.1.3.1
F5/BIG-IP 17.5.0 - 17.5.1.4
F5/BIG-IP 21.0.0
Published May 13, 2026
Tracked Since May 13, 2026