CVE-2026-13379Network attack vector

DNS state corruption or crash via search domain

Published Jul 30, 2026 · Updated Jul 30, 2026

Delimiter neutralization in OpenVPN Inc. OpenVPN 2.7_alpha1 through 2.7.4 allows remote attackers to corrupt Windows DNS state or crash the service. During disconnection, the interactive service combines crafted --dns search-domain entries with existing local DNS configuration and restores the SearchList state incorrectly. Exploitation requires a crafted search domain to reach a Windows client and the vulnerable disconnect path; the bounded effects are persistent DNS pollution or a service crash.

CVSS severity5.1
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Delimiter neutralization in OpenVPN Inc. OpenVPN 2.7_alpha1 through 2.7.4 allows remote attackers to corrupt Windows DNS state or crash the service. During disconnection, the interactive service combines crafted --dns search-domain entries with existing local DNS configuration and restores the SearchList state incorrectly. Exploitation requires a crafted search domain to reach a Windows client and the vulnerable disconnect path; the bounded effects are persistent DNS pollution or a service crash.

The record

CVE
CVE-2026-13379
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
OpenVPN Inc.
Product
OpenVPN
Classifications
CWE-125, CWE-142, T1565.001, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=2.7_alpha1 <=2.7.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenVPN Inc. · OpenVPNversion=2.7_alpha1 <=2.7.4

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
5.1OpenVPN Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:L/VI:N/VA:L/SC:H/SI:N/SA:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-142Improper Neutralization of Value Delimiters
T1565.001Stored Data Manipulation
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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