CVE-2026-40215 | BDVDB-2026-338577 Detail

OpenVPNOpenVPN

Description#

A race condition in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows remote attackers to potentially cause a server crash or leak heap memory via a use-after-free triggered during TLS session promotion.

Impact#

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

Weaknesses#

CWE-125 Out-of-bounds Read
CWE-416 Use After Free

References#

Exploit#

No public exploit known

History#

Version 12026-06-08Record published in the CVE List.
Version 22026-06-16Most recent update recorded in the CVE List.

Published

Published: 2026-06-08
Last modified: 2026-06-16

Vendor information

Vendor: OpenVPN
Product: OpenVPN

All OpenVPN vulnerabilities

Score

6.1 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 31.4.

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
>= 2.6.0 and <= 2.6.19
Fixed
Not stated
Vulnerable
>= 2.7_alpha1 and <= 2.7.1
Fixed
Not stated

Scoring System

CVSS v4.0

6.1 Medium

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

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