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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (13.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
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
- my.f5.com/manage/s/article/K000151309 (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.