F5 BIGIP SSL Profile Bug Undisclosed Traffic Blocks New Connections
CVE-2026-40629 Published on May 13, 2026
BIG-IP SSL/TLS vulnerability
When SSL profiles are configured on a virtual server, undisclosed traffic can cause the virtual server to stop processing new client connections. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Vulnerability Analysis
CVE-2026-40629 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
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-40629
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Affected Versions
F5 BIG-IP:- Version 21.0.0 and below * is unaffected.
- Version 17.5.0 and below 17.5.1.4 is affected.
- Version 17.1.0 and below 17.1.3.1 is affected.
- Version 16.1.0 and below * is affected.
- Version 2.0.0 and below 2.0.3 is affected.
- Version 1.7.0 and below 1.7.16 is affected.
- Version 2.0.0 and below 2.0.3 is affected.
- Version 1.1.0 and below 1.4.1 is affected.
- Version 2.0.0 and below 2.1.1 is affected.