Strix
26.1K

CVE-2026-42409

HIGHCVSS 8.7/10EPSS 0.26%

Last modified

CVE-2026-42409 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0
8.7/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability
0.26%

17.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
F5Big-Ip Next Cloud-Native Network Functions>= 1.1.0, <= 1.4.0
F5Big-Ip Next Cloud-Native Network Functions>= 2.0.0, <= 2.0.2
F5Big-Ip Next For Kubernetes>= 2.0.0, <= 2.1.0
F5Big-Ip Access Policy Manager21.0.0
F5Big-Ip Advanced Firewall Manager21.0.0
F5Big-Ip Advanced Web Application Firewall21.0.0
F5Big-Ip Analytics21.0.0
F5Big-Ip Application Acceleration Manager21.0.0
F5Big-Ip Application Security Manager21.0.0
F5Big-Ip Application Visibility And Reporting21.0.0
F5Big-Ip Automation Toolchain21.0.0
F5Big-Ip Carrier-Grade Nat21.0.0
F5Big-Ip Container Ingress Services21.0.0
F5Big-Ip Ddos Hybrid Defender21.0.0
F5Big-Ip Domain Name System21.0.0
F5Big-Ip Edge Gateway21.0.0
F5Big-Ip Fraud Protection Service21.0.0
F5Big-Ip Global Traffic Manager21.0.0
F5Big-Ip Link Controller21.0.0
F5Big-Ip Local Traffic Manager21.0.0
F5Big-Ip Policy Enforcement Manager21.0.0
F5Big-Ip Ssl Orchestrator21.0.0
F5Big-Ip Webaccelerator21.0.0
F5Big-Ip Websafe21.0.0
F5Big-Ip Access Policy Manager>= 16.1.0, <= 16.1.6
F5Big-Ip Advanced Firewall Manager>= 16.1.0, <= 16.1.6
F5Big-Ip Advanced Web Application Firewall>= 16.1.0, <= 16.1.6
F5Big-Ip Analytics>= 16.1.0, <= 16.1.6
F5Big-Ip Application Acceleration Manager>= 16.1.0, <= 16.1.6
F5Big-Ip Application Security Manager>= 16.1.0, <= 16.1.6
F5Big-Ip Application Visibility And Reporting>= 16.1.0, <= 16.1.6
F5Big-Ip Automation Toolchain>= 16.1.0, <= 16.1.6
F5Big-Ip Carrier-Grade Nat>= 16.1.0, <= 16.1.6
F5Big-Ip Container Ingress Services>= 16.1.0, <= 16.1.6
F5Big-Ip Ddos Hybrid Defender>= 16.1.0, <= 16.1.6
F5Big-Ip Domain Name System>= 16.1.0, <= 16.1.6
F5Big-Ip Edge Gateway>= 16.1.0, <= 16.1.6
F5Big-Ip Fraud Protection Service>= 16.1.0, <= 16.1.6
F5Big-Ip Global Traffic Manager>= 16.1.0, <= 16.1.6
F5Big-Ip Link Controller>= 16.1.0, <= 16.1.6
F5Big-Ip Local Traffic Manager>= 16.1.0, <= 16.1.6
F5Big-Ip Policy Enforcement Manager>= 16.1.0, <= 16.1.6
F5Big-Ip Ssl Orchestrator>= 16.1.0, <= 16.1.6
F5Big-Ip Webaccelerator>= 16.1.0, <= 16.1.6
F5Big-Ip Websafe>= 16.1.0, <= 16.1.6
F5Big-Ip Access Policy Manager>= 17.1.0, <= 17.1.3
F5Big-Ip Access Policy Manager>= 17.5.0, <= 17.5.1
F5Big-Ip Advanced Firewall Manager>= 17.1.0, <= 17.1.3
F5Big-Ip Advanced Firewall Manager>= 17.5.0, <= 17.5.1
F5Big-Ip Advanced Web Application Firewall>= 17.1.0, <= 17.1.3

Showing 50 of 87 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-42409?
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.
How severe is CVE-2026-42409?
CVE-2026-42409 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.
How do I fix CVE-2026-42409?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42409?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST