CVE-2026-40067

Severity CVSS v4.0:

HIGH

Type:

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Publication date:

13/05/2026

Last modified:

29/06/2026

Description

When a BIG-IP APM access policy is configured on a virtual server, undisclosed traffic can cause the apmd process to terminate.<br /> <br /> Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Impact

Vector 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 8.70 HIGH
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0

8.70

Severity 4.0

HIGH

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

7.50

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:f5:big-ip_access_policy_manager::::::::	16.1.0 (including)	16.1.6 (including)
cpe:2.3:a:f5:big-ip_access_policy_manager::::::::	17.1.0 (including)	17.1.3 (including)
cpe:2.3:a:f5:big-ip_access_policy_manager::::::::	17.5.0 (including)	17.5.1 (including)
cpe:2.3:a:f5:big-ip_access_policy_manager:21.0.0:::::::*

To consult the complete list of CPE names with products and versions, see this page

References to Advisories, Solutions, and Tools

https://my.f5.com/manage/s/article/K000161056