CVE-2025-8873: Arista Networks Eos

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Arista Networks Eos: from 4.33.0M, up to and including 4.33.4M; from 4.32.0M, up to and including 4.32.6.1M; from 4.31.0M, up to and including 4.31.7.1M; from 4.30.0M, up to and including 4.30.10M; from 4.29.0M, up to and including 4.29.10.1M

Published 2026-06-04. Last modified 2026-07-22.