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HIGH · 7.5

CVE-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 v...

Vulnerability Description

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.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
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

Related Weaknesses (CWE)

CWE-835

References

FAQ

What is CVE-2026-42920?

CVE-2026-42920 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 v...

How severe is CVE-2026-42920?

CVE-2026-42920 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42920?

Check the references section above for vendor advisories and patch information. Affected products include: F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager.