When a Client SSL profile is configured with Allow Dynamic Record Sizing on a UDP virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM…

Code

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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 a Client SSL profile is configured with Allow Dynamic Record Sizing on a UDP virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

2. Jun 18, 2026 · NIST NVD

   Updated

   When a Client SSL profile is configured with Allow Dynamic Record Sizing on a UDP virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected

• cpe f5/big-ip access policy managerversion unspecified
• 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 application security manager21.0.0
• cpe f5/big-ip application visibility and reporting21.0.0
• cpe f5/big-ip automation toolchain21.0.0

Sources

• CVE.orgVulnerability recordCVE-2026-42920

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-42920

  When a Client SSL profile is configured with Allow Dynamic Record Sizing on a UDP virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

  nvd.nist.gov

References

• Mitigation · my.f5.com