CVE-2026-19655CWE-20

CVE-2026-19655

Medium · published September 16, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
8.6
In the wild
Unconfirmed
What it is

On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00194 · 8.6th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-09-16T01:16Z
References (1)
https://www.arista.com/en/support/advisories-notices/security-advisory/24711-security-advisory-0155 · [email protected]
EPSS history
Timeline
  • 17 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 15 SEP 20:56Z
    On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthent
    cvelistv5