Advisoriesby IbisArista NetworksCVE-2026-86107
Arista Networks VeloCloud: out-of-bounds write
Fix: upgrade to 5.2.0.0 or later (4 fixed versions below)
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| VeloCloud Product | >= 1.0.0.0, < 5.2.0.0 | 5.2.0.0 |
| >= 5.2.0.0, < 5.2.7.0 | 5.2.7.0 | |
| >= 6.1.0.0, < 6.1.5.0 | 6.1.5.0 | |
| >= 6.4.0.0, < 6.4.2.0 | 6.4.2.0 | |
| VeloCloud Gateway Product | >= 1.0.0.0, < 5.2.0.0 | 5.2.0.0 |
| >= 5.2.0.0, < 5.2.7.0 | 5.2.7.0 | |
| >= 6.1.0.0, < 6.1.5.0 | 6.1.5.0 | |
| >= 6.4.0.0, < 6.4.2.0 | 6.4.2.0 |
Details and references
- CVSS 4.0
- 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-787