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Vulnerability record · CVE-2017-12166 · published 4 October 2017

CVE-2017-12166: Openvpn out-of-bounds write vulnerability

Openvpn · Openvpn

OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method 1 is used, possibly resulting in code execution.

9.8 CVSS 3.1 Critical EPSS 3.6% · top 10.9% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 6.8
3.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method 1 is used, possibly resulting in code execution.

CVSS:3.1/AV:N/AC:L/PR:N/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.securityfocus.com/bid/101153 Third Party AdvisoryVDB EntryURL Repurposed
http://www.securitytracker.com/id/1039470 Third Party AdvisoryVDB EntryURL Repurposed
https://community.openvpn.net/openvpn/wiki/CVE-2017-12166 PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/101153 Third Party AdvisoryVDB EntryURL Repurposed
http://www.securitytracker.com/id/1039470 Third Party AdvisoryVDB EntryURL Repurposed
https://community.openvpn.net/openvpn/wiki/CVE-2017-12166 PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00002.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2017-12166), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.