Main Vulnerability Database Vulnerabilities #VU147232

Server-Side Request Forgery (SSRF) in BIG-IQ and BIG-IP - CVE-2026-66842

Published: September 7, 2026

Vulnerability identifier: #VU147232

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-66842

CWE-ID: CWE-918

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to escalate privileges.

The vulnerability exists due to server-side request forgery in the Configuration utility when handling an undisclosed request. A remote user can create administrative user accounts to escalate privileges.

This is a control plane issue only and has no data plane exposure.

Affected software

BIG-IQ
BIG-IP

How to mitigate CVE-2026-66842

Install security update from vendor's website.

BIG-IQ - update to 8.4.2.1
BIG-IP - addressed in versions 17.1.3.4, 17.5.1.8, 21.0.0.3, 21.1.0.1

External References

https://my.f5.com/manage/s/article/K000162521

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