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CVE-2026-39458 When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced…

Description

When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products and versions

Product Affected versions Fixed in
BIG-IP 21.1 earliest → < 21.1.0 21.1.0
BIG-IP 21.0 21.0.0 → < 21.0.0.1 21.0.0.1
BIG-IP 17.5 17.5.0 → < 17.5.1.6 17.5.1.6
BIG-IP 17.1 17.1.0 → < 17.1.3.2 17.1.3.2
BIG-IP 16.1 16.1.0 → latest No fix stated
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