Description
An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenVPN | ovpn-dco-win | 2.0.0 – ≤ 2.5.8 | — |
Advisories 1
- WID-SEC-2026-1892 OpenVPN: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 10, 2026