CVE-2026-73435: CWE-345 Insufficient Verification of Data Authenticity in Arista Networks EOS
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-73435) involves insufficient verification of data authenticity (CWE-345) in Arista EOS when Open Shortest Path First version 2 (OSPFv2) is configured with authentication. An attacker on the same broadcast segment can send crafted OSPFv2 packets without authentication, leading to adjacency flapping and packet loss, which disrupts routing in the OSPF domain. The CVSS 3.1 score is 8.2 (high severity) with attack vector as adjacent network, low attack complexity, no privileges required, no user interaction, scope changed, no confidentiality impact, integrity impact low, and high availability impact.
Potential Impact
The vulnerability can cause routing instability by forcing OSPF adjacency flapping and packet loss, which can disrupt network routing across the OSPF domain. This impacts network availability but does not affect confidentiality and has limited integrity impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, network administrators should consider network segmentation or OSPF authentication configuration reviews to limit exposure from unauthenticated attackers on the same broadcast segment.
CVE-2026-73435: CWE-345 Insufficient Verification of Data Authenticity in Arista Networks EOS
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 v3.1
Score 8.2high
Affected software
Arista Networks
EOS
pkg:github/arista-networks/eosRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-73435) involves insufficient verification of data authenticity (CWE-345) in Arista EOS when Open Shortest Path First version 2 (OSPFv2) is configured with authentication. An attacker on the same broadcast segment can send crafted OSPFv2 packets without authentication, leading to adjacency flapping and packet loss, which disrupts routing in the OSPF domain. The CVSS 3.1 score is 8.2 (high severity) with attack vector as adjacent network, low attack complexity, no privileges required, no user interaction, scope changed, no confidentiality impact, integrity impact low, and high availability impact.
Potential Impact
The vulnerability can cause routing instability by forcing OSPF adjacency flapping and packet loss, which can disrupt network routing across the OSPF domain. This impacts network availability but does not affect confidentiality and has limited integrity impact.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, network administrators should consider network segmentation or OSPF authentication configuration reviews to limit exposure from unauthenticated attackers on the same broadcast segment.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:39:35.976Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaa621555bf5e2cf54c8cd0
Added to database: 09/16/2026, 09:32:05 UTC
Last enriched: 09/16/2026, 09:46:28 UTC
Last updated: 09/16/2026, 22:11:11 UTC
Views: 11
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