CVE-2025-53521

Severity CVSS v4.0:

CRITICAL

Type:

CWE-121 Stack-based Buffer Overflow

Publication date:

15/10/2025

Last modified:

31/03/2026

Description

When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE). <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:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 9.30 CRITICAL
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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): High
Integrity (VI): High
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0

9.30

Severity 4.0

CRITICAL

Vector 3.x

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

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Base Score 3.x

9.80

Severity 3.x

CRITICAL

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:f5:big-ip_access_policy_manager::::::::	15.1.0 (including)	15.1.10.8 (excluding)
cpe:2.3:a:f5:big-ip_access_policy_manager::::::::	16.1.0 (including)	16.1.6.1 (excluding)
cpe:2.3:a:f5:big-ip_access_policy_manager::::::::	17.1.0 (including)	17.1.3 (excluding)
cpe:2.3:a:f5:big-ip_access_policy_manager::::::::	17.5.0 (including)	17.5.1.3 (excluding)

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

CVE-2025-53521

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools