Riskcovery

CVE-2026-73458

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various rou

State
Published
Severity
9.2 Critical
Published
Sep 15, 2026
Updated
Sep 15, 2026
Reserved
Aug 12, 2026

Read the record on cve.org

Description

On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafted packet can cause the BFD session(s) to go down. This may result in undesirable network changes because various routing protocols monitor status on BFD session(s).

Scores

CVSSScoreVectorSource
4.09.2 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:HArista
3.18.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:HArista

Weaknesses

  • CWE-303 Incorrect Implementation of Authentication Algorithm

Affected Products

ProductVersions
EOSArista Networks
  • 4.36.0 through 4.36.1FAffectedfrom 4.36.2FNot affected
  • 4.35.0 through 4.35.5MAffectedfrom 4.35.6MNot affected
  • 4.34.0 through 4.34.7MAffectedfrom 4.34.8MNot affected
  • 4.33.0 through 4.33.8MAffectedfrom 4.33.9MNot affected

References

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