CVE-2026-73438
Security Advisory 0172
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, an unauthenticated attacker on the same OSPFv3 broadcast domain can send a specially crafted set of packets that can cause the Ospf3 agent to restart unexpectedly. The crash results in the loss of all OSPFv3 adjacencies on the affected device and may disrupt routing across the broader OSPF domain until the agent recovers. This issue was reported externally by Dravanet Inc., and Arista is not aware of any malicious exploitation of this vulnerability in customer networks.
| CWE | CWE-617 |
| Vendor | arista networks |
| Product | eos |
| Published | Sep 16, 2026 |
| Last Updated | Sep 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Arista Networks / EOS
4.36.0F ≤ 4.36.1F 4.35.0F ≤ 4.35.5M 4.34.0F ≤ 4.34.7M 4.33.0F ≤ 4.33.9M 1.0.0 < 4.33.0F
References
Credits
🔍 Dravanet Inc.