CVE-2026-73459

HIGHCVSS 7.4

Description

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.

Timeline

Published:September 16th, 2026 12:17 AM

Last modified:September 16th, 2026 8:17 PM

CVSS Scoring

CVSS v3: 7.4 (HIGH)

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weaknesses (CWE)

CWE-354

References & Reports

Advisories, patches, and third-party reports

https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160

Source: NIST NVD · Data may lag official sources by up to one minute