PT-2026-40647 · F5 · Big-Ip

Published 2026-05-13 · Updated 2026-05-17 · CVE-2026-40435

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/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

Description IP-based access restrictions for httpd do not cover all endpoints, which may allow connections from blocked addresses.

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

Fix

Weakness Enumeration

CWE-420

Related Identifiers

CVE-2026-40435

Affected Products

Big-Ip

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-40435 · Security Note
• https://twitter.com/f1tym1/status/2055991600061243471 · Twitter Post
• https://my.f5.com/manage/s/article/K000156604 · Patch, Vendor Advisory