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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (33.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
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
- my.f5.com/manage/s/article/K000150508 (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.