CVE-2026-86107

Security Advisory 0180

State: Published
Severity: 8.2 High
Published: Sep 16, 2026
Updated: Sep 16, 2026
Reserved: Sep 5, 2026

Description

The VeloCloud Edge and Gateway exhibit an out-of-bounds write vulnerability when processing tunneled IP fragments between authenticated overlay neighbors. This vulnerability impacts the VeloCloud VCMP tunnel protocol only.

A successful exploit can cause the affected process to terminate and restart, leading to a temporary disruption of traffic. Hosts on the internet that are unauthenticated and unable to form an overlay peer relationship can not trigger the vulnerable logic.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	Arista
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	Arista

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
VeloCloudArista Networks	1.0.0.0 to before 5.2.0.0Affected 5.2.0.0 to before 5.2.7.0Affected 6.1.0.0 to before 6.1.5.0Affected 6.4.0.0 to before 6.4.2.0Affected
VeloCloud GatewayArista Networks	1.0.0.0 to before 5.2.0.0Affected 5.2.0.0 to before 5.2.7.0Affected 6.1.0.0 to before 6.1.5.0Affected 6.4.0.0 to before 6.4.2.0Affected

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24736-security-advisory-0180vendor-advisory

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