CVE-2026-94127
F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-09-22. Federal due date: 2026-09-25.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Impact
F5 BIG-IP APM contains a heap-based buffer overflow vulnerability when access policy and an OAuth profile are configured on a virtual server. This vulnerability could allow an unauthenticated attacker to perform remote code execution.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| F5 | BIG-IP | from 17.5.0 before Hotfix-BIGIP-17.5.1.9.0.160.12-ENG from 17.1.0 before Hotfix-BIGIP-17.1.3.5.0.41.14-ENG from 21.1.0 before Hotfix-BIGIP-21.1.0.2.0.30.22-ENG |
| F5 | Big-Ip Access Policy Manager | from 17.0.0 through 17.1.3 from 17.5.0 through 17.5.1 Version 21.1.0 |