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CVE-2026-42920— BIG-IP DTLS Vulnerability

Quick assessment

Affected
F5 BIG-IP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

F5 BIG-IP是美国F5公司的一款集成了网络流量管理、应用程序安全管理、负载均衡等功能的应用交付平台。 F5 BIG-IP存在安全漏洞，该漏洞源于在UDP虚拟服务器上配置Allow Dynamic Record Sizing时，未公开的流量可能导致TMM终止。

CVSS 7.5 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 5

VendorProduct Version RangeStatus
F5 BIG-IP 21.1.0< * unaffected
21.0.0< 21.0.0.1 affected
17.5.0< 17.5.1.4 affected
17.1.0< 17.1.3.1 affected
16.1.0< * affected
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I. Basic Information for CVE-2026-42920

Vulnerability Information
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Vulnerability Title
BIG-IP DTLS Vulnerability
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
F5 BIG-IP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 BIG-IP是美国F5公司的一款集成了网络流量管理、应用程序安全管理、负载均衡等功能的应用交付平台。 F5 BIG-IP存在安全漏洞，该漏洞源于在UDP虚拟服务器上配置Allow Dynamic Record Sizing时，未公开的流量可能导致TMM终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 BIG-IP 21.1.0 ~ * -

II. Public POCs for CVE-2026-42920

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III. Intelligence Information for CVE-2026-42920

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Vendor Advisories for CVE-2026-42920 (1)

Same Patch Batch · F5 · 2026-05-13 · 51 CVEs total

CVE-2026-41225 9.1 CRITICAL iControl REST vulnerability
CVE-2026-41957 8.8 HIGH BIG-IP and BIG-IQ Configuration utility vulnerability
CVE-2026-40061 8.7 HIGH iControl REST and tmsh vulnerability
CVE-2026-42930 8.7 HIGH Appliance mode iControl REST vulnerability
CVE-2026-32673 8.7 HIGH BIG-IP scripted monitor vulnerability
CVE-2026-34176 8.7 HIGH Knowledge Appliance mode iControl REST vulnerability
CVE-2026-42945 8.1 HIGH NGINX ngx_http_rewrite_module vulnerability
CVE-2026-20916 8.1 HIGH BIG-IQ iControl REST vulnerability
CVE-2026-41217 7.9 HIGH BIG-IP tmsh vulnerability
CVE-2026-40629 7.5 HIGH BIG-IP SSL/TLS vulnerability
CVE-2026-40067 7.5 HIGH BIG-IP APM Vulnerability
CVE-2026-39455 7.5 HIGH BIG-IP Configuration utility vulnerability
CVE-2026-39458 7.5 HIGH BIG-IP DNS Cache vulnerability
CVE-2026-40423 7.5 HIGH BIG-IP SIP profile vulnerability
CVE-2026-41218 7.5 HIGH BIG-IP PEM iRules vulnerability
CVE-2026-40618 7.5 HIGH BIG-IP SSL/TLS vulnerability
CVE-2026-41956 7.5 HIGH BIG-IP TMM Vulnerability
CVE-2026-40060 7.5 HIGH BIG-IP Advanced WAF and ASM vulnerability
CVE-2026-41227 7.5 HIGH BIG-IP HTTP/2 Layer 7 Dos Protection vulnerability
CVE-2026-42409 7.5 HIGH BIG-IP HTTP/2 vulnerability

Showing top 20 of 51 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: BIG-IP
Same vendor: F5
Same weakness: CWE-835

V. Comments for CVE-2026-42920

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