Vulnerability · Published Jun 4, 2026 · Assigned by Arista
CVE-2025-8873Arista EOS Dataplane Denial of Service via Malformed IPsec Packet
High 7.5
In plain English
A high-severity security flaw in EOS from Arista Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Arista Networks | EOS | 4.33.0M – through 4.33.4M4.32.0M – through 4.32.6.1M4.31.0M – through 4.31.7.1M4.30.0M – through 4.30.10M4.29.0M – through 4.29.10.1M |
Weakness: CWE-1286 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H