An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.

Attack Vector Local

Attack Complexity High

Privileges Required Low

Attack Requirements Present

User Interaction Passive

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact None

Subsequent System Availability Impact High

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
OpenVPN OpenVPN unaffected
Version Status Constraints
2.7_alpha1 affected ≤ 2.7.6

No data.

No data.

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Advisories

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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-2026-78221 cve-icon cve-icon
History

Mon, 07 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
Title Memory Corruption and Sensitive Information Disclosure via Crafted NRPT Inputs in Windows Interactive Service
First Time appeared Openvpn
Openvpn openvpn
Vendors & Products Openvpn
Openvpn openvpn

Mon, 07 Sep 2026 07:45:00 +0000

Type Values Removed Values Added
Description An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.
Weaknesses CWE-131
References
Metrics cvssV4_0

{'score': 5.9, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:N/VA:H/SC:H/SI:N/SA:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: OpenVPN

Published:

Updated: 2026-09-07T07:28:14.135Z

Reserved: 2026-08-26T14:41:20.459Z

Link: CVE-2026-78221

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-07T08:17:12.813

Modified: 2026-09-07T08:17:12.813

Link: CVE-2026-78221

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-07T08:30:14Z

Weaknesses