Quick answers
- Is CVE-2026-11604 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-11604 being exploited in the wild.
- How severe is CVE-2026-11604?
- Informational severity, with a CVSS score of 5.6, published 10 June 2026.
- Which products and versions are affected?
- Openvpn Ovpn-Dco-Win 2.0.0 through 2.8.3.
- Is there a fix for CVE-2026-11604?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-11604 attacked?
- It is attacked over the network, in an operating system.
- Am I affected by CVE-2026-11604?
- Check whether you run Openvpn Ovpn-Dco-Win at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a heap-based buffer overflow (CWE-122) caused by an incorrect buffer size calculation (CWE-131) within the epoch key generator of the ovpn-dco-win driver. The flaw exists in versions 2.0.0 through 2.8.3. A remote authenticated peer can exploit this by sending a specifically crafted data packet over the VPN tunnel. Because the driver operates in kernel mode, the resulting out-of-bounds write (CWE-787) leads to kernel memory corruption and an immediate system crash (BSOD). While the CVSS 4.0 score provided by the CNA is 5.6 (Medium) due to local/authenticated requirements, the impact is a complete loss of availability for the host system.
Affected products
- OpenVPN ovpn-dco-win 2.0.0 through 2.8.3
Timeline
- 2026-06-10: disclosed
- 2026-06-10: advisory