#VU126171 Improper Validation of Syntactic Correctness of Input in Arista Extensible Operating System (EOS) and Arista CloudEOS VM - CVE-2025-8873
Published: April 15, 2026
Vulnerability identifier: #VU126171
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2025-8873
CWE-ID: CWE-1286
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Arista Extensible Operating System (EOS)
Arista CloudEOS VM
Arista Extensible Operating System (EOS)
Arista CloudEOS VM
Software vendor:
Arista Networks
Arista Networks
Description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper validation of syntactic correctness of input in the IPsec dataplane processing pipeline when processing a specially crafted packet. A remote attacker can send a specially crafted packet to cause a denial of service.
Only systems with IPsec configured are vulnerable. Non-IPsec traffic and IPsec traffic not originating or terminating on the system are not affected.
Remediation
Install security update from vendor's website.