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CVE-2026-42409 Details
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.
A denial-of-service vulnerability has been identified in F5 BIG-IP systems when an HTTP/2 profile is active, and an iRule using the HTTP::redirect or HTTP::respond command is applied to a virtual server. Under these conditions, certain undisclosed requests can lead to the termination of the Traffic Management Microkernel (TMM) process, causing a disruption as TMM restarts. This issue affects BIG-IP versions 21.0.0, 17.5.0 through 17.5.1, 17.1.0 through 17.1.3, and 16.1.0 through 16.1.6, as well as BIG-IP Next versions 1.7.0 through 1.7.16 and 2.0.0 through 2.0.2.
Users can upgrade to BIG-IP versions 21.0.0.1, 17.5.1.4, 17.1.3.1, or 1.4.1 for BIG-IP Next. For more information on managing BIG-IP product hotfixes, refer to the F5 article K13123.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 13, 2026Exploitation: NoneAutomatable: YesTechnical Impact: Partial
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://my.f5.com/manage/s/article/K000159034 | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| f5 big-ip next cloud-native network functions | >= 1.1.0, <= 1.4.0 >= 2.0.0, <= 2.0.2 |
CPE
Remediation
| |
| f5 big-ip next for kubernetes | >= 2.0.0, <= 2.1.0 |
CPE
Remediation
| |
| f5 big-ip access policy manager | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip advanced firewall manager | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip advanced web application firewall | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip analytics | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip application acceleration manager | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip application security manager | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip application visibility and reporting | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip automation toolchain | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip carrier-grade nat | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip container ingress services | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip ddos hybrid defender | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip domain name system | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip edge gateway | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip fraud protection service | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip global traffic manager | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip link controller | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip local traffic manager | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip policy enforcement manager | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip ssl orchestrator | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip webaccelerator | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
| f5 big-ip websafe | 21.0.0 >= 16.1.0, <= 16.1.6 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 23, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 13, 2026 | New CVE Received | [email protected] |