CVE-2026-63020
BIG-IP Configuration utility vulnerability
CVSS Score
3.1
EPSS Score
0.0%
EPSS Percentile
0th
A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may allow an attacker to spoof error messages Impact: An attacker may trick authenticated BIG-IP users into accessing malicious links and reflect a spoofed error message in the victim's BIG-IP Configuration utility web browser session. This is a control plane issue; there is no data plane exposure. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
| CWE | CWE-451 |
| Vendor | f5 |
| Product | big-ip |
| Published | Sep 2, 2026 |
| Last Updated | Sep 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
F5 / BIG-IP
21.1.0 < 21.1.0.1 21.0.0 < 21.0.0.3 17.5.0 < 17.5.1.8 17.1.0 < 17.1.3.4
Credits
F5 acknowledges Michał Majchrowicz, Marcin Wyczechowski and Piotr Zdunek (members of the AFINE Team) for bringing this issue to our attention and following the highest standards of coordinated disclosure.