CVE-2025-8873 HIGH

CVE-2025-8873: Arista EOS Dataplane Denial of Service via Malformed IPsec Packet

Vendor Arista Networks
Product EOS
Weakness CWE-1286
Published June 4, 2026
Last update June 5, 2026

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

On affected platforms running Arista EOS with IPsec configured, a specially crafted packet can cause the dataplane to stop processing all IPsec traffic. The control plane may detect this condition, and attempt to reset the IPsec processing pipeline. After reset traffic may not resume being processed. There is no impact to non-IPsec traffic or to IPsec traffic not originating or terminating on the system. This issue was reported by an Arista customer.

Key dates

02Disclosure timeline

June 4, 2026 CVE published
June 5, 2026 Record updated