PT-2026-40649 · F5 · Big-Ip

Published 2026-05-13 · Updated 2026-05-17 · CVE-2026-40462

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions F5 BIG-IP versions prior to 17.1.3.1 F5 BIG-IP versions prior to 17.5.1.4 F5 BIG-IP versions prior to 21.0.0.1

Description Incorrect permission assignment issues exist in iControl REST and an undisclosed command within the TMOS shell (tmsh). These flaws may allow an authenticated attacker to view sensitive information.

Recommendations Update to version 17.1.3.1 or later. Update to version 17.5.1.4 or later. Update to version 21.0.0.1 or later.

Fix

Incorrect Permission

Weakness Enumeration

CWE-732

Related Identifiers

CVE-2026-40462

Affected Products

Big-Ip

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-40462 · Security Note
• https://my.f5.com/manage/s/article/K83991477 · Vendor Advisory
• https://my.f5.com/manage/s/article/K000156581 · Patch, Vendor Advisory
• https://twitter.com/f1tym1/status/2055991603601240443 · Twitter Post