F5 · BIG-IP APM
CVE-2026-94127
BIG-IP APM OAuth vulnerability
What it is
When a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specific malicious traffic can lead to remote code execution (RCE). This vulnerability is only present when BIG-IP APM is configured as an OAuth Authorization Server. Deployments using APM strictly as an OAuth Client / Resource Server (without OAuth authorization server profiles configured) are not affected by this vulnerability.
Impact:
This vulnerability allows an unauthenticated attacker to perform remote code execution. The BIG-IP system in Appliance mode is also vulnerable. This is a data plane issue; there is no control plane exposure.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CISA: 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.
Deadline for US federal agencies: September 25, 2026
More exploited flaws from F5
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Mar 27, 2026 | Stack-Based Buffer Overflow | BIG-IP | Critical 9.3 | 2.3% |
| Oct 31, 2023 | Authentication Bypass | BIG-IP Configuration Utility | Critical 9.8 | 97% |
| Oct 31, 2023 | SQL Injection | BIG-IP Configuration Utility | High 8.8 | 4.2% |
| May 10, 2022 | Missing Authentication | BIG-IP | Critical 9.8 | >99.9% |
| Jan 18, 2022 | Buffer Overflow | BIG-IP Traffic Management Microkernel | Critical 9.8 | 62% |
| Nov 3, 2021 | Traffic Management User Interface (TMUI) Remote Code Execution | BIG-IP | Critical 9.8 | >99.9% |
| Nov 3, 2021 | iControl REST Remote Code Execution | BIG-IP and BIG-IQ Centralized Management | Critical 9.8 | 99.9% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.