What is CVE-2026-39459?

CVE-2026-39459 is a high-severity vulnerability in F5 Big-ip, classified under CWE-272. CVSS score: 7.2/10. Published 2026-05-13.

How severe is CVE-2026-39459?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in F5 Big-ip

CVE-2026-39459

A vulnerability exists in iControl REST and the TMOS Shell (tmsh) where a highly privileged, authenticated attacker with at least the Manager role can create configuration objects that allow running arbitrary commands. Note: Software ver…

EPSS: 0.001 (25.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

F5 Big-ip — versions 21.1.0, 21.0.0, 17.5.0

Weakness classification (CWE)

CWE-272

References

f5sirt@f5.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-39459?: CVE-2026-39459 is a high-severity vulnerability in F5 Big-ip, classified under CWE-272. CVSS score: 7.2/10. Published 2026-05-13.
How severe is CVE-2026-39459?: High severity. CVSS v3 base score is 7.2 out of 10.