CVE-2026-73435 Arista EOS - Denial of Service

Arista EOS with OSPFv2 configured contains a denial of service caused by specially crafted unauthenticated OSPFv2 packets, letting unauthenticated attackers cause adjacency flapping and packet loss, exploit requires attacker on same broadcast segment.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.19% 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:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-345

Vendor fix

Update to the latest Arista EOS version with OSPFv2 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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