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CVE-2018-9336

24
FAUCET Score

CVE-2018-9336 describes a double-free vulnerability in openvpnserv.exe, the interactive service helper in OpenVPN 2.4.x before 2.4.6, affecting OpenVPN and Slackware Linux distributions. This high-severity vulnerability (CVSS 7.8) allows a local attacker to trigger a denial-of-service through memory corruption, with potential for privilege escalation, by sending a malformed request. There is no evidence of active exploitation, public exploit code, or significant community discussion or media coverage for this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.4.0, < 2.4.6CPE matchmatch criteria
cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
13.0CPE matchmatch criteria
cpe:2.3:o:slackware:slackware_linux:13.0:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:slackware:slackware_linux:13.1:*:*:*:*:*:*:*
13.37CPE matchmatch criteria
cpe:2.3:o:slackware:slackware_linux:13.37:*:*:*:*:*:*:*
14.0CPE matchmatch criteria
cpe:2.3:o:slackware:slackware_linux:14.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.61%
Probability of exploitation in next 30 days
EPSS Percentile
45.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0061 is in the 84th percentile among its peer group of 17,061 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
bindvendor investigatingvia llm_extracted
kerasvendor investigatingvia llm_extracted
mitelvendor investigatingvia llm_extracted

Vendor Advisories (3)

mitelllm-mitel-1881f624dc6061b0HIGH

[R1] OpenVPN Windows Service Double Free

May 4, 2018
kerasllm-keras-82e1320afd0a0a4cHIGH

[R1] OpenVPN Windows Service Double Free

May 4, 2018
bindllm-bind-110e0c131810a2c4HIGH

OpenVPN Windows Service Double Free

May 4, 2018

References

community.openvpn.net / openvpn/wiki/ChangesInOpenvpn24
Release NotesVendor Advisory
github.com / OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b
PatchThird Party Advisory
github.com / OpenVPN/openvpn/releases/tag/v2.4.6
Release NotesThird Party Advisory
tenable.com / security/research/tra-2018-09
ExploitThird Party Advisory
slackware.com / security/viewer.php
Mailing ListThird Party Advisory