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CVE-2026-42920 Details
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.
A denial-of-service vulnerability has been identified in F5 BIG-IP systems when a Client SSL profile is set to allow dynamic record sizing on a UDP virtual server. Under certain conditions, this configuration can lead to the unexpected termination of the Traffic Management Microkernel (TMM), causing a disruption in service. This issue affects BIG-IP versions 21.0.0, 17.5.0 through 17.5.1, and 17.1.0 through 17.1.3, as well as BIG-IP Next for Kubernetes. Notably, this vulnerability allows remote, unauthenticated attackers to cause a DoS condition on the system, with no exposure to the control plane, only the data plane.
To address this vulnerability, users can disable the 'Allow Dynamic Record Sizing' option in the Client SSL profile. After turning off this setting, the profile should be updated to apply the change.
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/K000160901 | [email protected] | MitigationVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-835 | Loop with Unreachable Exit Condition ('Infinite Loop') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| f5 big-ip access policy manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip advanced firewall manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip advanced web application firewall | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip analytics | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip application acceleration manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip application security manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip application visibility and reporting | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip automation toolchain | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip carrier-grade nat | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip container ingress services | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip ddos hybrid defender | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip domain name system | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip edge gateway | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip fraud protection service | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip global traffic manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip link controller | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip local traffic manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip policy enforcement manager | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip ssl orchestrator | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip webaccelerator | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
| f5 big-ip websafe | 21.0.0 >= 17.1.0, <= 17.1.3 >= 17.5.0, <= 17.5.1 >= 16.1.0, <= 16.1.6 |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 18, 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] |