Heap-based buffer overflow in BIG-IP and BIG-IP APM - CVE-2026-94127
Published: September 23, 2026
Vulnerability identifier: #VU151801
CSH Severity: Critical
CVSS v4: 9.3 [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]
CVE-ID: CVE-2026-94127
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in APM OAuth when processing malicious traffic. A remote attacker can send malicious traffic to execute arbitrary code.
Only deployments configured as an OAuth Authorization Server are affected; deployments used strictly as an OAuth Client or Resource Server are not affected.
Note, the vulnerability is being actively exploited in the wild.
Affected software
BIG-IP
BIG-IP APM
BIG-IP APM
How to mitigate CVE-2026-94127
Install security update from vendor's website.
BIG-IP - addressed in versions 17.1.3.5.0.41.14, 17.5.1.9.0.160.12, 21.1.0.2.0.30.22
BIG-IP APM - addressed in versions 17.1.3.5.0.41.14, 17.5.1.9.0.160.12, 21.1.0.2.0.30.22
BIG-IP APM - addressed in versions 17.1.3.5.0.41.14, 17.5.1.9.0.160.12, 21.1.0.2.0.30.22