Buffer Overflow Vulnerability in OpenVPN Affects Windows Interactive Service
CVE-2026-78221

5.9MEDIUM

Key Information:

Vendor

Openvpn
Status
Openvpn
Vendor
CVE Published:
7 September 2026

What is CVE-2026-78221?

A vulnerability exists in the Windows Interactive Service of OpenVPN versions 2.7_alpha1 to 2.7.6 due to incorrect buffer size calculations. This flaw enables local authenticated users to craft NRPT inputs that can lead to memory corruption and the potential disclosure of sensitive information.

Affected Version(s)

OpenVPN Windows 2.7_alpha1 <= 2.7.6

References

https://community.openvpn.net/Security%20Announcements/CV...
vendor-advisory

CVSS V4

Score:
5.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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