ZDF
Sign inSign up

Vulnerabilities

Vulnerability · 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 Traff…

Published May 13, 2026 · catalog updated Jun 23, 2026 · big-ip next cloud-native network functions

Check if you run it

No confirmed exploitation is on record for CVE-2026-42409. EPSS is 0.46%. Act only if a listed version of big-ip next cloud-native network functions is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.46%
Remediation
Not established
Affected products
cpe f5/big-ip access policy manager · cpe f5/big-ip advanced firewall manager · cpe f5/big-ip advanced web application firewall · cpe f5/big-ip analytics · cpe f5/big-ip application acceleration manager · cpe f5/big-ip next cloud-native network functions

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe f5/big-ip access policy manager21.0.0
  • cpe f5/big-ip advanced firewall manager21.0.0
  • cpe f5/big-ip advanced web application firewall21.0.0
  • cpe f5/big-ip analytics21.0.0
  • cpe f5/big-ip application acceleration manager21.0.0
  • cpe f5/big-ip next cloud-native network functionsversion unspecified
  • cpe f5/big-ip next for kubernetesversion unspecified

How to fix CVE-2026-42409

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-42409. EPSS is 0.46%. Act only if a listed version of big-ip next cloud-native network functions is installed.

Which versions are affected?

Compare what you have installed with f5/big-ip access policy manager 21.0.0; f5/big-ip advanced firewall manager 21.0.0; f5/big-ip advanced web application firewall 21.0.0; f5/big-ip analytics 21.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-476: NULL Pointer Dereference. EPSS 0.46%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Kubernetes security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 13, 2026 · NIST NVD

    Detected

    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.

  2. Jun 23, 2026 · NIST NVD

    Updated

    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

  • CVE.orgVulnerability recordCVE-2026-42409

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-42409

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-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 Technica

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.