An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00466.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Openvpn Subscribe
Openvpn Subscribe

No data.

No data.

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Vendors Products
Openvpn Subscribe
Openvpn Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://community.openvpn.net/Security%20Announcements/CVE-2026-88964 cve-icon cve-icon
History

Sun, 18 Oct 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Openvpn
Openvpn openvpn
Vendors & Products Openvpn
Openvpn openvpn

Fri, 16 Oct 2026 02:45:00 +0000

Type Values Removed Values Added
Title Integer Underflow in OpenVPN Causing DoS and Memory Disclosure via Domain Search Options

Thu, 15 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Title Integer Underflow in OpenVPN Domain Search Parsing Causes Denial of Service and Memory Disclosure

Wed, 14 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 14 Oct 2026 19:00:00 +0000

Type Values Removed Values Added
Title Integer Underflow in OpenVPN Domain Search Parsing Causes Denial of Service and Memory Disclosure

Tue, 13 Oct 2026 22:30:00 +0000

Type Values Removed Values Added
Description An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options
Weaknesses CWE-125
CWE-191
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: OpenVPN

Published:

Updated: 2026-10-14T18:09:15.335Z

Reserved: 2026-09-10T15:53:07.519Z

Link: CVE-2026-88964

cve-icon Vulnrichment

Updated: 2026-10-14T18:09:09.683Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-13T23:19:13.687

Modified: 2026-10-15T20:38:04.303

Link: CVE-2026-88964

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-18T15:30:17Z

Weaknesses