Medium severity · published Jun 10, 2026
CVE-2026-11604
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…
6.5
CVSS
0.3%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OV
ovpn-dco-win · OpenVPN
2.0.0 through 2.5.8 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11604
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11604
Vendor Advisory
https://community.openvpn.net/Security%20Announcements/CVE-2026-11604
Release Notes
https://github.com/OpenVPN/ovpn-dco-win/releases
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