Low severity · published Sep 2, 2026
CVE-2026-63020
BIG-IP Configuration utility vulnerability
3.1
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
BIG-IP · F5
21.1.0 before 21.1.0.1; 21.0.0 before 21.0.0.3; 17.5.0 before 17.5.1.8; 17.1.0 before 17.1.3.4 · source: vendor
BA
Big-ip Access Policy Manager · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BA
Big-ip Advanced Firewall Manager · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BA
Big-ip Advanced Web Application Firewall · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BA
Big-ip Analytics · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BA
Big-ip Application Acceleration Manager · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BA
Big-ip Application Security Manager · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BA
Big-ip Application Visibility And Reporting · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BA
Big-ip Automation Toolchain · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BC
Big-ip Carrier-grade Nat · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BC
Big-ip Container Ingress Services · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
BD
Big-ip Ddos Hybrid Defender · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 through 21.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63020
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63020
Mitigation
https://my.f5.com/manage/s/article/K000161728
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