Vulnerability · Published Sep 16, 2026 · Assigned by Arista
CVE-2026-86107Security Advisory 0180
Medium 5.9
In plain English
A medium-severity out-of-bounds write in VeloCloud 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 31% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Arista Networks | VeloCloud | 1.0.0.0 – before 5.2.0.05.2.0.0 – before 5.2.7.06.1.0.0 – before 6.1.5.06.4.0.0 – before 6.4.2.0 |
| Arista Networks | VeloCloud Gateway | 1.0.0.0 – before 5.2.0.05.2.0.0 – before 5.2.7.06.1.0.0 – before 6.1.5.06.4.0.0 – before 6.4.2.0 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H