BIG-IP
CVE-2026-42409: BIG-IP HTTP/2 vulnerability
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| BIG-IP 21.1 | Not affected |
| BIG-IP 21.0 | 21.0.0.1 or later |
| BIG-IP 17.5 | 17.5.1.4 or later |
| BIG-IP 17.1 | 17.1.3.1 or later |
| BIG-IP 16.1 | * or later |
| BIG-IP Next SPK 2.0 | 2.0.3 or later |
| BIG-IP Next SPK 1.7 | 1.7.17 or later |
| BIG-IP Next CNF 2.0 | 2.0.3 or later |
| BIG-IP Next CNF 1.4 | 1.4.1 or later |
| BIG-IP Next for Kubernetes 2.0 | 2.1.1 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 12 Oct 2026.