CVE-2026-73459
Security Advisory 0160
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
On affected platforms running Arista EOS with IS-IS configured, an unauthenticated attacker who can inject a specially crafted IS-IS LSP PDU can cause the legitimate LSP to be unexpectedly purged from the IS-IS link-state database. This may result in traffic loss.
| CWE | CWE-354 |
| 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
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.