PT-2026-40642 · F5 · Big-Ip

Published 2026-05-13 · Updated 2026-05-17 · CVE-2026-39459

Positive Technologies (AI Summary)

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions F5 BIG-IP versions prior to 17.1.3.2 F5 BIG-IP versions prior to 17.5.1.6 F5 BIG-IP versions prior to 21.0.0.2

Description A least privilege violation exists in iControl REST and the TMOS Shell (tmsh). A highly privileged, authenticated attacker with at least the Manager role can create configuration objects to execute arbitrary commands.

Recommendations Update to version 17.1.3.2 or later. Update to version 17.5.1.6 or later. Update to version 21.0.0.2 or later.

Fix

Weakness Enumeration

CWE-272

Related Identifiers

CVE-2026-39459

Affected Products

Big-Ip

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-39459 · Security Note
• https://my.f5.com/manage/s/article/K000160863 · Patch, Vendor Advisory
• https://twitter.com/f1tym1/status/2055947539854021006 · Twitter Post