CVE-2026-81738 | BDVDB-2026-368772 Detail

OpenVPNOpenVPN

Description#

OpenVPN 2.5.0 through 2.7.6 on Windows using the tap-windows6 driver allows attackers to trigger an out-of-bounds write via crafted DOMAIN-SEARCH entries

Impact#

Per CVSS v4.0: confidentiality impact none, integrity impact low, availability impact low. Attack vector: network.

Weaknesses#

CWE-121 Stack-based buffer overflow
CWE-193 Off-by-one error
CWE-787 Out-of-bounds Write

References#

https://community.openvpn.net/Security%20Announcements/CVE-2026-81738

Exploit#

No public exploit known

History#

Version 12026-09-07Record published in the CVE List.
Version 22026-09-08Most recent update recorded in the CVE List.

Published

Published: 2026-09-07
Last modified: 2026-09-08

Vendor information

Vendor: OpenVPN
Product: OpenVPN

All OpenVPN vulnerabilities

Score

2.3 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 26.5.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

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

Affected Systems

Vulnerable
>= 2.5.0 and <= 2.7.6
Fixed
Not stated

Scoring System

CVSS v4.0

2.3 Low

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L

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

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).