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CVE-2026-34019

BIG-IP BFD vulnerability

Medium6.3EPSS 0.29%
Published
Updated
Reserved
Assigned by
f5

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.

Scores

CVSS scores of CVE-2026-34019, by who scored it
Scored byCVSSScoreVector
f5CNA (assigner)4.0Medium6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
f5CNA (assigner)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Analyzed4.0Medium6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.29% · top 78% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.

Weakness

Affected products

  • F5 · BIG-IP

    • unaffected 21.0.0 – < *
    • affected 17.5.0 – < 17.5.1
    • affected 17.1.0 – < 17.1.3
    • affected 16.1.0 – < *

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .