CVE-2026-20916

HIGH

BIG-IQ 8.4.0 - Authenticated Arbitrary File Write via iControl REST Endpoint

Title source: llm

Description

An authenticated iControl REST user with low privileges can create or modify arbitrary files through an undisclosed iControl REST endpoint on the BIG-IQ system. 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/K000158029

Scores

CVSS v3 8.1

EPSS 0.0009

EPSS Percentile 25.5%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-22

Status published

Products (1)

F5/BIG-IQ 8.4.0 - 8.4.1

Published May 13, 2026

Tracked Since May 13, 2026