UpHeron
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Servers and applications

CVE-2017-12166

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.

Severity
Critical 9.8
Published
4 Oct 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.3.18, 2.4.4
Exploit chance
3.6% in the next 30 daysHigher than 89% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Out-of-bounds write (CWE-787)
Attack
Over the network · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
NVD

Affected software

SoftwareAffected versions
OpenVPNServers and applications · cpe:a:openvpn:openvpn
  • Every version before 2.3.18
  • From 2.4.0 before 2.4.4

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-12166
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-12166