CVE-2025-8873

Arista EOS Dataplane Denial of Service via Malformed IPsec Packet

State: Published
Severity: 8.7 High
Published: Jun 4, 2026
Updated: Jun 5, 2026
Reserved: Aug 11, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	Arista
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Arista

Weaknesses

CWE-1286 Improper Validation of Syntactic Correctness of Input

Affected Products

Product	Versions
EOSArista Networks	4.33.0M through 4.33.4MAffected 4.32.0M through 4.32.6.1MAffected 4.31.0M through 4.31.7.1MAffected 4.30.0M through 4.30.10MAffected 4.29.0M through 4.29.10.1MAffected

References

https://www.arista.com/en/support/advisories-notices/security-advisory/22869-security-advisory-0127vendor-advisory

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