CVE-2026-63020

EUVD-2026-70135
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.
UI
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
f5CNA
3.1 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
f5big-ip
21.1.0 ≤
𝑥
< 21.1.0.1
CNA
f5big-ip
21.0.0 ≤
𝑥
< 21.0.0.3
CNA
f5big-ip
17.5.0 ≤
𝑥
< 17.5.1.8
CNA
f5big-ip
17.1.0 ≤
𝑥
< 17.1.3.4
CNA
Common Weakness Enumeration
References
https://my.f5.com/manage/s/article/K000161728