F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
Description
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.
What to do
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.
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Details
- Vendor
- F5
- Product
- BIG-IP APM
- CVE
- CVE-2026-94127
- Affected versions
- BIG-IP 21.1: from 21.1.0 to Hotfix-BIGIP-21.1.0.2.0.30.22-ENG (excluded) — fixed in Hotfix-BIGIP-21.1.0.2.0.30.22-ENG
BIG-IP 17.5: from 17.5.0 to Hotfix-BIGIP-17.5.1.9.0.160.12-ENG (excluded) — fixed in Hotfix-BIGIP-17.5.1.9.0.160.12-ENG
BIG-IP 17.1: from 17.1.0 to Hotfix-BIGIP-17.1.3.5.0.41.14-ENG (excluded) — fixed in Hotfix-BIGIP-17.1.3.5.0.41.14-ENG (from the advisory and NVD; check the exact builds in the official advisory) - CVSS score
- 9.8
- Actively exploited
- Yes, listed in the CISA Known Exploited Vulnerabilities catalog
- CISA due date
- September 25, 2026 (deadline for US federal agencies: a good benchmark for you too)
- Source
- CISA KEV – original advisory
- Published
- September 22, 2026
The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.