High severity · published Jun 4, 2026
CVE-2025-8873
Arista EOS Dataplane Denial of Service via Malformed IPsec Packet
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EO
EOS · Arista Networks
4.33.0M through 4.33.4M; 4.32.0M through 4.32.6.1M; 4.31.0M through 4.31.7.1M; 4.30.0M through 4.30.10M; 4.29.0M through 4.29.10.1M · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-8873
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-8873
www.arista.com
https://www.arista.com/en/support/advisories-notices/security-advisory/22869-security-advisory-0127
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