CVE-2026-73446: CWE-696: Incorrect Behavior Order in Arista Networks EOS
On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.
CVE-2026-73446: CWE-696: Incorrect Behavior Order in Arista Networks EOS
Description
On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.
CVSS v3.1
Score 7.4high
Affected software
Arista Networks
EOS
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Arista
- Date Reserved
- 2026-08-12T16:42:47.920Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa9d57455bf5e2cf587e5fe
Added to database: 09/15/2026, 23:32:04 UTC
Last updated: 09/15/2026, 23:32:04 UTC
Views: 1
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