CVE-2026-73435 — HIGH (8.2)

Vulnerability Description

On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.

CVSS Score

8.2

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

LOW

Availability

HIGH

Related Weaknesses (CWE)

CWE-345

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24727-sec

FAQ

What is CVE-2026-73435?

CVE-2026-73435 is a vulnerability with a CVSS score of 8.2 (HIGH). On affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, ...

How severe is CVE-2026-73435?

CVE-2026-73435 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-73435?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.