F5 BIG-IP: TMM Crash via HTTP Enforce RFC Requests
CVE-2025-36557 Published on May 7, 2025
BIG-IP HTTP vulnerability
When an HTTP profile with the Enforce RFC Compliance option is configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Vulnerability Analysis
CVE-2025-36557 can be exploited 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 Classic Buffer Overflow Vulnerability?
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.
CVE-2025-36557 has been classified to as a Classic Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2025-36557
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Affected Versions
F5 BIG-IP:- Version 17.5.0 and below * is unaffected.
- Version 17.1.0 and below 17.1.2 is affected.
- Version 16.1.0 and below 16.1.5 is affected.
- Version 15.1.0 and below * is unaffected.
- Version 1.8.0 and below 2.0.0 is affected.
- Version 1.7.0 and below 1.7.9 is affected.
- Version 2.0.0 and below * is unaffected.
- Version 1.1.0 and below 1.4.0 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.