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CVE-2026-34019— BIG-IP BFD 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，该漏洞源于在静态和动态路由协议中配置双向转发检测时，未公开的流量可能导致TMM停止处理BFD数据包，导致配置的路由协议故障转移。

CVSS 5.3 · Medium EPSS 0.29% · P22

Affected Version Matrix 4

VendorProduct Version RangeStatus
F5 BIG-IP 21.0.0< * unaffected
17.5.0< 17.5.1 affected
17.1.0< 17.1.3 affected
16.1.0< * affected
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I. Basic Information for CVE-2026-34019

Vulnerability Information
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Vulnerability Title
BIG-IP BFD vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
When Bidirectional Forwarding Detection (BFD) is configured in Static and Dynamic routing protocols, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to stop processing BFD packets and cause the configured routing protocol to fail over.  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:L
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的资源池
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，该漏洞源于在静态和动态路由协议中配置双向转发检测时，未公开的流量可能导致TMM停止处理BFD数据包，导致配置的路由协议故障转移。
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 21.0.0 ~ * -

II. Public POCs for CVE-2026-34019

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III. Intelligence Information for CVE-2026-34019

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Vendor Advisories for CVE-2026-34019 (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-2026-34176 8.7 HIGH Knowledge Appliance mode iControl REST vulnerability
CVE-2026-42930 8.7 HIGH Appliance mode iControl REST vulnerability
CVE-2026-40061 8.7 HIGH iControl REST and tmsh vulnerability
CVE-2026-32673 8.7 HIGH BIG-IP scripted monitor vulnerability
CVE-2026-20916 8.1 HIGH BIG-IQ iControl REST vulnerability
CVE-2026-42945 8.1 HIGH NGINX ngx_http_rewrite_module vulnerability
CVE-2026-41217 7.9 HIGH BIG-IP tmsh vulnerability
CVE-2026-42409 7.5 HIGH BIG-IP HTTP/2 vulnerability
CVE-2026-41218 7.5 HIGH BIG-IP PEM iRules vulnerability
CVE-2026-41227 7.5 HIGH BIG-IP HTTP/2 Layer 7 Dos Protection vulnerability
CVE-2026-42920 7.5 HIGH BIG-IP DTLS Vulnerability
CVE-2026-39458 7.5 HIGH BIG-IP DNS Cache vulnerability
CVE-2026-39455 7.5 HIGH BIG-IP Configuration utility vulnerability
CVE-2026-40423 7.5 HIGH BIG-IP SIP profile vulnerability
CVE-2026-40067 7.5 HIGH BIG-IP APM Vulnerability
CVE-2026-40060 7.5 HIGH BIG-IP Advanced WAF and ASM vulnerability
CVE-2026-40618 7.5 HIGH BIG-IP SSL/TLS vulnerability
CVE-2026-40629 7.5 HIGH BIG-IP SSL/TLS 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-410

V. Comments for CVE-2026-34019

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