CVE-2026-84256 | BDVDB-2026-368787 Detail

OpenVPNOpenVPN

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

Impact#

Per CVSS v4.0: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.

Weaknesses#

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')

References#

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

Exploit#

No public exploit known

History#

Version 12026-09-07Record published in the CVE List.
Version 22026-10-13Most recent update recorded in the CVE List.

Published

Published: 2026-09-07
Last modified: 2026-10-13

Vendor information

Vendor: OpenVPN
Product: OpenVPN

All OpenVPN vulnerabilities

Score

7.7 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 32.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Command Injection

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 2.1_rc10 and <= 2.6.22
Fixed
Not stated
Vulnerable
>= 2.7_alpha1 and <= 2.7.7
Fixed
Not stated

Scoring System

CVSS v4.0

7.7 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	Present
Privileges Required	Low
User Interaction	None
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).