Spoofing attack in BIG-IP - CVE-2026-63020
Published: September 7, 2026
Vulnerability identifier: #VU147233
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63020
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to spoof error messages in an authenticated BIG-IP user's Configuration utility web browser session.
The vulnerability exists due to user interface misrepresentation of critical information in an undisclosed BIG-IP Configuration utility page when authenticated BIG-IP users access malicious links. A remote attacker can trick authenticated BIG-IP users into accessing malicious links to spoof error messages in their Configuration utility web browser sessions.
This is a control plane issue with no data plane exposure.
Affected software
BIG-IP
How to mitigate CVE-2026-63020
Install security update from vendor's website.
BIG-IP - addressed in versions 17.1.3.4, 17.5.1.8, 21.1.0.1