Actively exploited in the wild
F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
F5 - BIG-IP APM · Listed in the CISA KEV since 2026-09-22. This indicates confirmed attacks in production environments.
Required action: 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.
CVE-2026-94127
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Elevated risk71th percentile - higher than 71% of all known CVEs
Summary
When a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specially crafted traffic can lead to remote code execution (RCE). The vulnerability exists only when BIG-IP APM is configured as an OAuth Authorization Server; deployments using APM strictly as an OAuth Client/Resource Server are not affected.
Risk Assessment
An unauthenticated attacker can remotely execute arbitrary code on the BIG-IP system, including in Appliance mode, potentially leading to full system and network traffic compromise.
Recommendation
If BIG-IP APM is used as an OAuth Authorization Server, immediately apply the vendor's available fixes or restrict exposure of such configuration to the minimum necessary.
Other vulnerabilities in BIG-IP APM
See all- CVE-2026-40067High
A vulnerability in BIG-IP APM causes undisclosed traffic to terminate the apmd process when an APM access policy is configured on a virtual server.
- CVE-2025-61933Medium
A reflected cross-site scripting (XSS) vulnerability exists in an undisclosed page of BIG-IP APM that allows an attacker to run JavaScript in the context of the targeted logged-out user. Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- CVE-2025-61960High
When a per-request policy is configured on a BIG-IP APM portal access virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- CVE-2025-54854High
When a BIG-IP APM OAuth access profile (Resource Server or Resource Client) is configured on a virtual server, undisclosed traffic can cause the apmd process to terminate.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS