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CVE-2017-12166

33
FAUCET Score

CVE-2017-12166 is a critical buffer overflow vulnerability affecting OpenVPN versions prior to 2.3.3 and 2.4.4 when using key-method 1. This flaw allows for unauthenticated remote code execution with a CVSS score of 9.8, indicating a severe impact on confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, suggesting awareness among security researchers. Organizations using affected OpenVPN versions should prioritize patching to mitigate this high-risk vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.3.18CPE matchmatch criteria
cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
>= 2.4.0, < 2.4.4CPE matchmatch criteria
cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.63%
Probability of exploitation in next 30 days
EPSS Percentile
88.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0363 is in the 81st percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

community.openvpn.net / openvpn/wiki/CVE-2017-12166
PatchVendor Advisory
lists.debian.org / debian-lts-announce/2022/05/msg00002.html
Mailing ListThird Party Advisory
securityfocus.com / bid/101153
Third Party AdvisoryVDB EntryURL Repurposed
securitytracker.com / id/1039470
Third Party AdvisoryVDB EntryURL Repurposed