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Vulnerability record · CVE-2018-9336 · published 1 May 2018

CVE-2018-9336: Openvpn double free vulnerability

Openvpn · Openvpn

openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before 2.4.6 allows a local attacker to cause a double-free of memory by sending a malformed request to the interactive service. This could cause a denial-of-service through memory corruption or possibly have unspecified other impact including privilege escalation.

7.8 CVSS 3.0 High EPSS 0.59% · top 51.4% CWE-415 · Double free
7.8CVSS 3.0 base score, v2 4.6
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before 2.4.6 allows a local attacker to cause a double-free of memory by sending a malformed request to the interactive service. This could cause a denial-of-service through memory corruption or possibly have unspecified other impact including privilege escalation.

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761 Mailing ListThird Party Advisory
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24 Release NotesVendor Advisory
https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b PatchThird Party Advisory
https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6 Release NotesThird Party Advisory
https://www.tenable.com/security/research/tra-2018-09 ExploitThird Party Advisory
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761 Mailing ListThird Party Advisory
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24 Release NotesVendor Advisory
https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b PatchThird Party Advisory
https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6 Release NotesThird Party Advisory
https://www.tenable.com/security/research/tra-2018-09 ExploitThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-9336), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.