High 7.5Published Jun 4, 2026

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

Updated under an hour ago (Oct 26, 2026, 3:20 PM ET)

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It affects Arista Networks EOS. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Arista Networks EOS

Exploited in the last 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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-1286
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Arista
NVD analysis: Awaiting Analysis
Record last updated: Jun 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Arista Networks EOS arista_networks:eos (from the name)	from 4.33.0M through 4.33.4M; from 4.32.0M through 4.32.6.1M; from 4.31.0M through 4.31.7.1M; from 4.30.0M through 4.30.10M; from 4.29.0M through 4.29.10.1M	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.