Out-of-bounds Read in F5 Big-Ip
CVE-2025-61951
Undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. This issue may occur when a Datagram Transport Layer Security (DTLS) 1.2 virtual server is enabled with a Server SSL profile that is configured with a certificate, key, and the SSL Sign Hash set to ANY, and the backend server is enabled with DTLS 1.2 and client authentication. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (13.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- F5 Big-ip — versions 17.5.0, 17.1.0, 16.1.0
- F5 Big-ip_access_policy_manager — versions 17.5.0
- F5 Big-ip_advanced_firewall_manager — versions 17.5.0
- F5 Big-ip_advanced_web_application_firewall — versions 17.5.0
- F5 Big-ip_analytics — versions 17.5.0
- F5 Big-ip_application_acceleration_manager — versions 17.5.0
- F5 Big-ip_application_security_manager — versions 17.5.0
- F5 Big-ip_application_visibility_and_reporting — versions 17.5.0
- F5 Big-ip_automation_toolchain — versions 17.5.0
- F5 Big-ip_carrier-grade_nat — versions 17.5.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- f5sirt@f5.com (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-61951?
- CVE-2025-61951 is a high-severity vulnerability in F5 Big-Ip, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2025-10-15.
- How severe is CVE-2025-61951?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-61951 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.