CVE-2026-73437 Arista EOS - Misconfiguration

Arista EOS with DHCP relay configured contains a vulnerability caused by lack of source validation in DHCP reply forwarding, letting unauthenticated attackers with network access supply malicious network parameters, exploit requires network access.

CVSS base score 9.6 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Misconfiguration
Impact
Man In The Middle, Denial Of Service
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-345

Vendor fix

Update to the latest version with DHCP relay source validation fixes.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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