CVE-2026-42920 - Vulnerability 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.

Published: 2026-05-13

Score: 8.7 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

BIG-IP

unknown

Version	Status	Constraints
`21.1.0`	unaffected	< *
`21.0.0`	affected	< 21.0.0.1
`17.5.0`	affected	< 17.5.1.4
`17.1.0`	affected	< 17.1.3.1
`16.1.0`	affected	< *

Configuration 1 [-]

OR	cpe:2.3:a:f5:big-ip_access_policy_manager:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_advanced_firewall_manager:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_analytics:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_application_acceleration_manager:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_application_security_manager:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_automation_toolchain:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_carrier-grade_nat:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_container_ingress_services:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_domain_name_system:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_edge_gateway:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_fraud_protection_service:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_global_traffic_manager:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_link_controller:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_local_traffic_manager:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_policy_enforcement_manager:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_ssl_orchestrator:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_webaccelerator:21.0.0:::::::*
	cpe:2.3:a:f5:big-ip_websafe:21.0.0:::::::*

Configuration 2 [-]

OR	cpe:2.3:a:f5:big-ip_access_policy_manager::::::::
	cpe:2.3:a:f5:big-ip_access_policy_manager::::::::
	cpe:2.3:a:f5:big-ip_advanced_firewall_manager::::::::
	cpe:2.3:a:f5:big-ip_advanced_firewall_manager::::::::
	cpe:2.3:a:f5:big-ip_advanced_web_application_firewall::::::::
	cpe:2.3:a:f5:big-ip_advanced_web_application_firewall::::::::
	cpe:2.3:a:f5:big-ip_analytics::::::::
	cpe:2.3:a:f5:big-ip_analytics::::::::
	cpe:2.3:a:f5:big-ip_application_acceleration_manager::::::::
	cpe:2.3:a:f5:big-ip_application_acceleration_manager::::::::
	cpe:2.3:a:f5:big-ip_application_security_manager::::::::
	cpe:2.3:a:f5:big-ip_application_security_manager::::::::
	cpe:2.3:a:f5:big-ip_application_visibility_and_reporting::::::::
	cpe:2.3:a:f5:big-ip_application_visibility_and_reporting::::::::
	cpe:2.3:a:f5:big-ip_automation_toolchain::::::::
	cpe:2.3:a:f5:big-ip_automation_toolchain::::::::
	cpe:2.3:a:f5:big-ip_carrier-grade_nat::::::::
	cpe:2.3:a:f5:big-ip_carrier-grade_nat::::::::
	cpe:2.3:a:f5:big-ip_container_ingress_services::::::::
	cpe:2.3:a:f5:big-ip_container_ingress_services::::::::
	cpe:2.3:a:f5:big-ip_ddos_hybrid_defender::::::::
	cpe:2.3:a:f5:big-ip_ddos_hybrid_defender::::::::
	cpe:2.3:a:f5:big-ip_domain_name_system::::::::
	cpe:2.3:a:f5:big-ip_domain_name_system::::::::
	cpe:2.3:a:f5:big-ip_edge_gateway::::::::
	cpe:2.3:a:f5:big-ip_edge_gateway::::::::
	cpe:2.3:a:f5:big-ip_fraud_protection_service::::::::
	cpe:2.3:a:f5:big-ip_fraud_protection_service::::::::
	cpe:2.3:a:f5:big-ip_global_traffic_manager::::::::
	cpe:2.3:a:f5:big-ip_global_traffic_manager::::::::
	cpe:2.3:a:f5:big-ip_link_controller::::::::
	cpe:2.3:a:f5:big-ip_link_controller::::::::
	cpe:2.3:a:f5:big-ip_local_traffic_manager::::::::
	cpe:2.3:a:f5:big-ip_local_traffic_manager::::::::
	cpe:2.3:a:f5:big-ip_policy_enforcement_manager::::::::
	cpe:2.3:a:f5:big-ip_policy_enforcement_manager::::::::
	cpe:2.3:a:f5:big-ip_ssl_orchestrator::::::::
	cpe:2.3:a:f5:big-ip_ssl_orchestrator::::::::
	cpe:2.3:a:f5:big-ip_webaccelerator::::::::
	cpe:2.3:a:f5:big-ip_webaccelerator::::::::
	cpe:2.3:a:f5:big-ip_websafe::::::::
	cpe:2.3:a:f5:big-ip_websafe::::::::

Configuration 3 [-]

OR	cpe:2.3:a:f5:big-ip_access_policy_manager::::::::
	cpe:2.3:a:f5:big-ip_advanced_firewall_manager::::::::
	cpe:2.3:a:f5:big-ip_advanced_web_application_firewall::::::::
	cpe:2.3:a:f5:big-ip_analytics::::::::
	cpe:2.3:a:f5:big-ip_application_acceleration_manager::::::::
	cpe:2.3:a:f5:big-ip_application_security_manager::::::::
	cpe:2.3:a:f5:big-ip_application_visibility_and_reporting::::::::
	cpe:2.3:a:f5:big-ip_automation_toolchain::::::::
	cpe:2.3:a:f5:big-ip_carrier-grade_nat::::::::
	cpe:2.3:a:f5:big-ip_container_ingress_services::::::::
	cpe:2.3:a:f5:big-ip_ddos_hybrid_defender::::::::
	cpe:2.3:a:f5:big-ip_domain_name_system::::::::
	cpe:2.3:a:f5:big-ip_edge_gateway::::::::
	cpe:2.3:a:f5:big-ip_fraud_protection_service::::::::
	cpe:2.3:a:f5:big-ip_global_traffic_manager::::::::
	cpe:2.3:a:f5:big-ip_link_controller::::::::
	cpe:2.3:a:f5:big-ip_local_traffic_manager::::::::
	cpe:2.3:a:f5:big-ip_policy_enforcement_manager::::::::
	cpe:2.3:a:f5:big-ip_ssl_orchestrator::::::::
	cpe:2.3:a:f5:big-ip_webaccelerator::::::::
	cpe:2.3:a:f5:big-ip_websafe::::::::

No data.

Vendor Product Confidence Versions

Big-ip

100%

Version	Status	Scheme	Platform
`[21.1.0,*]`	unaffected	semver	—
`[21.0.0,21.0.0.1)`	affected	generic	—
`[17.5.0,17.5.1.4)`	affected	generic	—
`[17.1.0,17.1.3.1)`	affected	generic	—
`[16.1.0,*]`	affected	semver	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

No advisories yet.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00263.

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://my.f5.com/manage/s/article/K000160901

History

Wed, 13 May 2026 19:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		F5 F5 big-ip
Vendors & Products		F5 F5 big-ip

Wed, 13 May 2026 17:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 13 May 2026 15:15:00 +0000

Type	Values Removed	Values Added
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.
Title		BIG-IP DTLS Vulnerability
Weaknesses		CWE-835
References		https://my.f5.com/manage/s/article/K000160901
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}`

Subscriptions

F5 Big-ip Big-ip Access Policy Manager Big-ip Advanced Firewall Manager Big-ip Advanced Web Application Firewall Big-ip Analytics Big-ip Application Acceleration Manager Big-ip Application Security Manager Big-ip Application Visibility And Reporting Big-ip Automation Toolchain Big-ip Carrier-grade Nat Big-ip Container Ingress Services Big-ip Ddos Hybrid Defender Big-ip Domain Name System Big-ip Edge Gateway Big-ip Fraud Protection Service Big-ip Global Traffic Manager Big-ip Link Controller Big-ip Local Traffic Manager Big-ip Policy Enforcement Manager Big-ip Ssl Orchestrator Big-ip Webaccelerator Big-ip Websafe

MITRE

Status: PUBLISHED

Assigner: f5

Published: 2026-05-13T14:12:33.219Z

Updated: 2026-05-13T16:14:10.743Z

Reserved: 2026-04-30T23:02:47.685Z

Link: CVE-2026-42920

Vulnrichment

Updated: 2026-05-13T16:14:06.305Z

NVD

Status : Analyzed

Published: 2026-05-13T16:16:49.390

Modified: 2026-06-18T13:54:22.423

Link: CVE-2026-42920

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-05-13T19:00:14Z

Weaknesses

CWE-835

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable yes

Technical Impact partial

Subscriptions

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