Low [CVE-2026-63020] 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 low-severity F5 advisory covers CVE-2026-63020 affecting BIG-IP.
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Summary
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.
- BIG-IP 21.1.0 before 21.1.0.1
- BIG-IP 21.0.0 before 21.0.0.3
- BIG-IP 17.5.0 before 17.5.1.8
- BIG-IP 17.1.0 before 17.1.3.4
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 21.1.0.1
- 21.0.0.3
- 17.5.1.8
- 17.1.3.4
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 21.1.0.1, 21.0.0.3, 17.5.1.8, 17.1.3.4. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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