OSPFv3 Vulnerability in Arista EOS Software
CVE-2026-73455

8.9HIGH

Key Information:

Vendor

Arista Networks

Status
Eos
Vendor
CVE Published:
16 September 2026

What is CVE-2026-73455?

On systems utilizing Arista EOS with Open Shortest Path First version 3 (OSPFv3) enabled, a specially crafted network packet may trigger unexpected restarts of the OSPFv3 agent. This could disrupt network operations and impact connectivity, making it critical for administrators to apply recommended mitigations and updates to secure their environments.

Affected Version(s)

EOS 1.0.0 < 4.33.0F

EOS 4.33.0F <= 4.33.8M

EOS 4.34.0F <= 4.34.6M

References

https://www.arista.com/en/support/advisories-notices/secu...
vendor-advisory

CVSS V4

Score:
8.9
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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