CVE-2026-73444CWE-303

CVE-2026-73444

Medium · published September 16, 2026

CVSS v3.1
4.7
EPSS
0%
Percentile
21.4
In the wild
Unconfirmed
What it is

On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the virtual router master role, enabling the attacker to intercept, modify, or discard traffic that hosts on the segment send to the virtual gateway address.

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CVSS v4.0
5.3 · CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00299 · 21.4th percentile
Weakness
CWE-303 · Incorrect Implementation of Authentication Algorithm
Published
2026-09-16T02:16Z
References (1)
https://www.arista.com/en/support/advisories-notices/security-advisory/24713-security-advisory-0157 · [email protected]
EPSS history
Timeline
  • 17 SEP 03:32Z
    EPSS moved — → 0%
    epss
  • 15 SEP 21:11Z
    On affected platforms running Arista EOS with VRRPv2 IP Authentication Header (IP-AH) authentication configured, an unauthenticated attacker with access to the layer 2 network segment on which VRRP is running could bypass VRRP authentication and claim the
    cvelistv5