CVE-2026-73446
Security Advisory 0160
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-696 |
| Vendor | arista networks |
| Product | eos |
| Published | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Arista Networks / EOS
4.36.0 ≤ 4.36.1F 4.35.0 ≤ 4.35.5M 4.34.0 ≤ 4.34.7.1M 4.33.0 ≤ 4.33.9M 4.32.0 < 4.33.0F 4.31.0 < 4.32.0F
References
Credits
This issue was discovered internally by Arista and the company is not aware of any malicious uses of these issues in customer networks.