F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability
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…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 4 / 5
- KEV catalog (CISA)22 Sept 2026
- Exploited in EUVD (ENISA)22 Sept 2026
- Used by ransomwareno
- EPSS above 10 %26.6%
- No account, over the networkyes
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: 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.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
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.
Affected products
- 17.5.0 <Hotfix-BIGIP-17.5.1.9.0.160.12-ENG
- 17.1.0 <Hotfix-BIGIP-17.1.3.5.0.41.14-ENG
- 21.1.0 <Hotfix-BIGIP-21.1.0.2.0.30.22-ENG
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
-
Published
-
Exploitation reported (ENISA)
-
Added to the KEV catalog
-
CISA remediation due date
-
EPSS peak: 26.6%
References
Other exploited vulnerabilities from the same vendor
- CVE-2025-53521F5 BIG-IP Stack-Based Buffer Overflow Vulnerability5.6 · Background exploitation
- CVE-2023-46748F5 BIG-IP Configuration Utility SQL Injection Vulnerability4.8 · Background exploitation
- CVE-2023-46747F5 BIG-IP Configuration Utility Authentication Bypass Vulnerability9.8 · Background exploitation
- CVE-2022-1388F5 BIG-IP Missing Authentication Vulnerability9.9 · Background exploitation
- CVE-2021-22991F5 BIG-IP Traffic Management Microkernel Buffer Overflow8.2 · Background exploitation
- CVE-2021-22986F5 BIG-IP and BIG-IQ Centralized Management iControl REST Remote Code Execution Vulnerability9.9 · Background exploitation