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Vulnerability Details :

CVE-2026-11604

Summary
Assigner-OpenVPN
Assigner Org ID-36a55730-e66d-4d39-8ca6-3c3b3017965e
Published At-10 Jun, 2026 | 21:04
Updated At-11 Jun, 2026 | 13:27
Rejected At-
Credits

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).

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:OpenVPN
Assigner Org ID:36a55730-e66d-4d39-8ca6-3c3b3017965e
Published At:10 Jun, 2026 | 21:04
Updated At:11 Jun, 2026 | 13:27
Rejected At:
▼CVE Numbering Authority (CNA)

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
OpenVPN
Product
ovpn-dco-win
Platforms
  • Windows
Default Status
unaffected
Versions
Affected
  • From 2.0.0 through 2.5.8 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-131CWE-131 Incorrect calculation of buffer size
CWECWE-122CWE-122 Heap-based buffer overflow
CWECWE-787CWE-787 Out-of-bounds write
Type: CWE
CWE ID: CWE-131
Description: CWE-131 Incorrect calculation of buffer size
Type: CWE
CWE ID: CWE-122
Description: CWE-122 Heap-based buffer overflow
Type: CWE
CWE ID: CWE-787
Description: CWE-787 Out-of-bounds write
Metrics
VersionBase scoreBase severityVector
4.05.6MEDIUM
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
Version: 4.0
Base score: 5.6
Base severity: MEDIUM
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/OpenVPN/ovpn-dco-win/releases
product
https://community.openvpn.net/Security%20Announcements/CVE-2026-11604
vendor-advisory
Hyperlink: https://github.com/OpenVPN/ovpn-dco-win/releases
Resource:
product
Hyperlink: https://community.openvpn.net/Security%20Announcements/CVE-2026-11604
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@openvpn.net
Published At:10 Jun, 2026 | 22:16
Updated At:11 Jun, 2026 | 15:21

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).

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.6MEDIUM
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/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
Type: Secondary
Version: 4.0
Base score: 5.6
Base severity: MEDIUM
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/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
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-122Secondarysecurity@openvpn.net
CWE-131Secondarysecurity@openvpn.net
CWE-787Secondarysecurity@openvpn.net
CWE ID: CWE-122
Type: Secondary
Source: security@openvpn.net
CWE ID: CWE-131
Type: Secondary
Source: security@openvpn.net
CWE ID: CWE-787
Type: Secondary
Source: security@openvpn.net
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://community.openvpn.net/Security%20Announcements/CVE-2026-11604security@openvpn.net
N/A
https://github.com/OpenVPN/ovpn-dco-win/releasessecurity@openvpn.net
N/A
Hyperlink: https://community.openvpn.net/Security%20Announcements/CVE-2026-11604
Source: security@openvpn.net
Resource: N/A
Hyperlink: https://github.com/OpenVPN/ovpn-dco-win/releases
Source: security@openvpn.net
Resource: N/A

Change History

0
Information is not available yet

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Details not found