What is CVE-2026-63020?

CVE-2026-63020 is a low-severity vulnerability in F5 Big-Ip, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 3.1/10. Published 2026-09-02.

How severe is CVE-2026-63020?

Low severity. CVSS v3 base score is 3.1 out of 10.

Vulnerability in F5 Big-Ip

CVE-2026-63020

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 v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

F5 Big-ip

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

f5sirt@f5.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-63020?: CVE-2026-63020 is a low-severity vulnerability in F5 Big-Ip, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 3.1/10. Published 2026-09-02.
How severe is CVE-2026-63020?: Low severity. CVSS v3 base score is 3.1 out of 10.