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F5 Networks BIG-IP : BIG-IP APM vulnerability (K000156741)

critical Nessus Plugin ID 270605

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

The version of F5 Networks BIG-IP installed on the remote host is prior to 15.1.10.8 / 16.1.6.1 / 17.1.3 / 17.5.1.3. It is, therefore, affected by a vulnerability as referenced in the K000156741 advisory.

 When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE). (CVE-2025-53521)Important: We have learned that this vulnerability has been exploited. If your BIG-IP APM system is running a vulnerable version, or was upgraded from one, please do the following actions:- ReviewK000160486: Indicators of Compromise for c05d5254.- If compromise is suspected, reviewK11438344: Considerations and guidance when you suspect a security compromise on a BIG-IP system.

Tenable has extracted the preceding description block directly from the F5 Networks BIG-IP security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K000156741.

See Also

https://my.f5.com/manage/s/article/K000156741

Plugin Details

Severity: Critical

ID: 270605

File Name: f5_bigip_SOL000156741.nasl

Version: 1.5

Type: local

Published: 10/15/2025

Updated: 4/1/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.0

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2025-53521

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 9.3

Threat Vector: CVSS:4.0/E:A

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

Vulnerability Information

CPE: cpe:/h:f5:big-ip, cpe:/a:f5:big-ip_access_policy_manager

Required KB Items: Host/local_checks_enabled, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/15/2025

Vulnerability Publication Date: 10/15/2025

CISA Known Exploited Vulnerability Due Dates: 3/30/2026

Reference Information

CVE: CVE-2025-53521

IAVA: 2025-A-0771