CVE-2026-73459CWE-354

CVE-2026-73459

High · published September 16, 2026

CVSS v3.1
7.4
EPSS
0%
Percentile
6.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.4 · HIGH
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS v4.0
7.0 · CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
EPSS
0.00173 · 6.4th percentile
Weakness
CWE-354 · Improper Validation of Integrity Check Value
Published
2026-09-16T04:17Z
References (1)
https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160 · [email protected]
EPSS history
Timeline
  • 17 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 15 SEP 23:16Z
    Security Advisory 0160
    cvelistv5