CVE-2026-73458 Arista EOS - Denial of Service

Arista EOS contains a denial of service caused by specially crafted packets targeting authenticated Bidirectional Forwarding Detection (BFD) sessions, letting attackers disrupt BFD sessions and cause network instability, exploit requires authenticated BFD sessions.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.40% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-303

Vendor fix

Update to the latest Arista EOS version with BFD session fixes.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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