CVE-2026-40631

HIGH

F5 BIG-IP 21.1.0-21.0.0.2 Authenticated Privilege Escalation via iControl SOAP

Title source: llm

Description

An authenticated attacker with the Resource Administrator or Administrator role can modify configuration objects through iControl SOAP resulting in privilege escalation. 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/K000160979

Scores

CVSS v3 8.7

EPSS 0.0007

EPSS Percentile 21.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-552

Status published

Products (5)

F5/BIG-IP 16.1.0

F5/BIG-IP 17.1.0 - 17.1.3.2

F5/BIG-IP 17.5.0 - 17.5.1.6

F5/BIG-IP 21.0.0 - 21.0.0.2

F5/BIG-IP 21.1.0

Published May 13, 2026

Tracked Since May 13, 2026