PT-2026-40643 · F5 · Big-Ip

Published 2026-05-13 · Updated 2026-05-17 · CVE-2026-40060

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

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 When a BIG-IP Advanced WAF or ASM security policy is configured on a virtual server, undisclosed requests can cause the bd process to terminate.

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

Unchecked Return Value

Weakness Enumeration

CWE-252

Related Identifiers

CVE-2026-40060

Affected Products

Big-Ip

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-40060 · Security Note
• https://twitter.com/f1tym1/status/2055947537975062920 · Twitter Post
• https://my.f5.com/manage/s/article/K000160727 · Patch, Vendor Advisory