CVE-2025-13751

Local service interruption via named-pipe error exit

Published Dec 3, 2025 · Updated Dec 12, 2025

Denial of service in OpenVPN 2.5.0 through 2.6.16 and 2.7_alpha1 through 2.7_rc2 on Windows allows local users to stop VPN connections. The interactive service's named-pipe accept loop exits on a client connect-and-drop error instead of resetting the pipe, while silent clients can block workers and accumulate handles. Any authenticated local user can interrupt every OpenVPN connection until the service is restarted or the system reboots.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in OpenVPN 2.5.0 through 2.6.16 and 2.7_alpha1 through 2.7_rc2 on Windows allows local users to stop VPN connections. The interactive service's named-pipe accept loop exits on a client connect-and-drop error instead of resetting the pipe, while silent clients can block workers and accumulate handles. Any authenticated local user can interrupt every OpenVPN connection until the service is restarted or the system reboots.

The record

CVE
CVE-2025-13751
Published
Dec 3, 2025
Updated
Dec 12, 2025
Vendor
OpenVPN Inc.
Product
OpenVPN
Classifications
CWE-775, CWE-770, CWE-841, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.5.0 <=2.6.16
  2. Affected versionversion=2.7_alpha1 <=2.7_rc2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenVPN Inc. · OpenVPNversion=2.5.0 <=2.6.16; version=2.7_alpha1 <=2.7_rc2

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1.3OpenVPN Inc.CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/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:Clear

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-775Missing Release of File Descriptor or Handle after Effective Lifetime
CWE-770Allocation of Resources Without Limits or Throttling
CWE-841Improper Enforcement of Behavioral Workflow
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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