HOMEVULNERABILITIESCVE-2018-9336
HIGH

CVE-2018-9336

CWE-415Published: May 1, 2018· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2018-9336 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

openvpn1 product(s)
openvpn
slackware1 product(s)
slackware linux
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b
PATCHhttps://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b
ADVISORYhttp://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761
ADVISORYhttps://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24
ADVISORYhttps://github.com/OpenVPN/openvpn/releases/tag/v2.4.6
ADVISORYhttps://www.tenable.com/security/research/tra-2018-09
ADVISORYhttp://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761
ADVISORYhttps://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24
ADVISORYhttps://github.com/OpenVPN/openvpn/releases/tag/v2.4.6
ADVISORYhttps://www.tenable.com/security/research/tra-2018-09

All References (10)

→
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761Mailing List · Third Party Advisory
→
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24Release Notes · Vendor Advisory
→
https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79bPatch · Third Party Advisory
→
https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6Release Notes · Third Party Advisory
→
https://www.tenable.com/security/research/tra-2018-09Exploit · Third Party Advisory
→
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761Mailing List · Third Party Advisory
→
https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24Release Notes · Vendor Advisory
→
https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79bPatch · Third Party Advisory
→
https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6Release Notes · Third Party Advisory
→
https://www.tenable.com/security/research/tra-2018-09Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2018-9336
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-415
CISA KEVNo
Affected2 vendor(s)
PublishedMay 1, 2018

Related CVEs (CWE-415)

CVE-2018-0101
10.0
CVE-2016-6912
9.8
CVE-2015-8880
9.8
CVE-2015-7700
9.8
CVE-2016-3177
9.8
CVE-2017-1000232
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-9336 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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