Vulnerability · Published Jun 10, 2026 · Assigned by OpenVPN
CVE-2026-11604
Medium 5.6
In plain English
A medium-severity heap buffer overflow in ovpn-dco-win from OpenVPN. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).
Severity (CVSS 4.0)5.6Medium
Exploit odds (30 days)0.3%top 72.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenVPN | ovpn-dco-win | 2.0.0 – through 2.5.8 |
Weakness: CWE-131, CWE-122, CWE-787 · Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H