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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0475
Heap-based Buffer Overflow Vulnerability in F5 BIG-IP APM

Original Issue Date:September 24, 2026

Severity Rating: CRITICAL

Software Affected

  • F5 BIG-IP APM version 21.1.0 before Hotfix-BIGIP-21.1.0.2.0.30.22-ENG
  • F5 BIG-IP APM version 17.5.0 before Hotfix-BIGIP-17.5.1.9.0.160.12-ENG
  • F5 BIG-IP APM version 17.1.0 before Hotfix-BIGIP-17.1.3.5.0.41.14-ENG

Overview

A heap-based buffer overflow vulnerability has been reported in F5 BIG-IP APM that could allow an unauthenticated remote attacker to execute arbitrary code on the targeted system.

Target Audience:
All end-user organizations and individuals using affected versions of F5 BIG-IP APM.

Risk Assessment:
High risk of remote code execution.

Impact Assessment:
Potential for remote code execution.

Description

F5 BIG-IP APM (Access Policy Manager) is a secure access management solution that provides authentication, authorization, and application access services for enterprise environments.

A heap-based buffer overflow vulnerability has been reported in F5 BIG-IP APM when an APM access policy and an OAuth profile are configured on a virtual server. The vulnerability is present only when BIG-IP APM is configured as an OAuth Authorization Server. An unauthenticated remote attacker could exploit this vulnerability by sending specific malicious traffic to an affected virtual server.

Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to execute arbitrary code on the targeted system.

Note - This vulnerability is being actively exploited in the wild.

Solution

Apply appropriate updates as mentioned by the vendor:
https://my.f5.com/manage/s/article/K000162605

Vendor Information

F5
https://www.f5.com/

References

 
https://my.f5.com/manage/s/article/K000162605

CVE Name
CVE-2026-94127

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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