Vulnerability details

CVE-2026-84256

OpenVPN OpenVPN

CVSS 4.0

7.7High

Official description

An argument parsing issue in OpenVPN 2.1_rc10 through 2.6.22 and 2.7_alpha1 through 2.7.7 on Windows allows remote authenticated users to execute arbitrary commands via a crafted certificate subject

CVSS scores

Score	Version	Source	Vector
7.7High	4.0	CVEProject cvelistV5 (CNA) (OpenVPN)	`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

Affected products

Vendor	Product	Versions	Source
OpenVPN	OpenVPN	2.1_rc10 ≤ v ≤ 2.6.22	CVEProject cvelistV5 (CNA)
OpenVPN	OpenVPN	2.7_alpha1 ≤ v ≤ 2.7.7	CVEProject cvelistV5 (CNA)

References and advisories

https://community.openvpn.net/Security%20Announcements/CVE-2026-84256 vendor-advisory

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Details

Published: 2026-09-07
Last updated: 2026-10-14
State: Published
Assigner (CNA): OpenVPN

Exploit prediction (EPSS)

0.38%

Probability of exploitation in 30 days

32.5%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-78
Improper neutralization of special elements used in an OS command ('OS command injection')
CWE-88
Improper neutralization of argument delimiters in a command ('argument injection')