CVE-2026-42409

HIGH

F5 BIG-IP HTTP/2 iRule - TMM Denial of Service

Title source: manual
STIX 2.1

Description

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.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
https://my.f5.com/manage/s/article/K000159034

Scores

CVSS v3 7.5
EPSS 0.0011
EPSS Percentile 29.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (10)
F5/BIG-IP 16.1.0
F5/BIG-IP 17.1.0 - 17.1.3.1
F5/BIG-IP 17.5.0 - 17.5.1.4
F5/BIG-IP 21.0.0 - 21.0.0.1
F5/BIG-IP 21.1.0
F5/BIG-IP Next CNF 1.4.0 - 1.4.1
F5/BIG-IP Next CNF 2.0.0 - 2.0.3
F5/BIG-IP Next for Kubernetes 2.0.0 - 2.1.1
F5/BIG-IP Next SPK 1.7.0 - 1.7.17
F5/BIG-IP Next SPK 2.0.0 - 2.0.3
Published May 13, 2026
Tracked Since May 13, 2026