F5 BIGIP LTM Client SSL Memory Leak
CVE-2025-61974 Published on October 15, 2025
BIG-IP SSL/TLS vulnerability
When a client SSL profile is configured on a virtual server, undisclosed requests can cause an increase in memory resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Vulnerability Analysis
CVE-2025-61974 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Memory Leak Vulnerability?
The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is often triggered by improper handling of malformed data or unexpectedly interrupted sessions. In some languages, developers are responsible for tracking memory allocation and releasing the memory. If there are no more pointers or references to the memory, then it can no longer be tracked and identified for release.
CVE-2025-61974 has been classified to as a Memory Leak vulnerability or weakness.
Products Associated with CVE-2025-61974
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Affected Versions
F5 BIG-IP:- Version 17.5.0 and below 17.5.1.3 is affected.
- Version 17.1.0 and below 17.1.3 is affected.
- Version 16.1.0 and below 16.1.6.1 is affected.
- Version 15.1.0 and below 15.1.10.8 is affected.
- Version 2.0.0 and below * is affected.
- Version 1.9.0 and below * is affected.
- Version 1.8.0 and below * is affected.
- Version 1.7.0 and below * is affected.
- Version 2.0.0 and below * is affected.
- Version 1.1.0 and below * is affected.
- Version 2.0.0 and below * is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.