Vulnerability in F5 Big-Ip
CVE-2026-34019
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.
EPSS: 0.003 (21.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- F5 Big-ip — versions 21.0.0, 17.5.0, 17.1.0
- F5 Big-ip_access_policy_manager — versions 17.5.0
- F5 Big-ip_advanced_firewall_manager — versions 17.5.0
- F5 Big-ip_advanced_web_application_firewall — versions 17.5.0
- F5 Big-ip_analytics — versions 17.5.0
- F5 Big-ip_application_acceleration_manager — versions 17.5.0
- F5 Big-ip_application_security_manager — versions 17.5.0
- F5 Big-ip_application_visibility_and_reporting — versions 17.5.0
- F5 Big-ip_automation_toolchain — versions 17.5.0
- F5 Big-ip_carrier-grade_nat — versions 17.5.0
Weakness classification (CWE)
References
- f5sirt@f5.com (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-34019?
- CVE-2026-34019 is a medium-severity vulnerability in F5 Big-Ip, classified under CWE-410. CVSS score: 5.3/10. Published 2026-05-13.
- How severe is CVE-2026-34019?
- Medium severity. CVSS v3 base score is 5.3 out of 10.