CVE-2018-9336

Exp

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.

Published: 2018-05-01 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-9336 is rated Exploit Available (54.5/100): CVSS High severity, with low exploitation likelihood (EPSS 0.09%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2018-9336

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-9336

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-17 0.04% 0.09% +0.05%
2 2023-03-07 0.95% 0.04% -0.91%
3 2022-02-04 — 0.95% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-9336

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
4.6 2.0 MEDIUM
AV:L/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 6.4 [email protected]

Weakness enumeration for CVE-2018-9336

OS Trackers for CVE-2018-9336

vendor priority summary link
alpine high CVE-2018-9336: 1 source package rows (openvpn); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. https://security.alpinelinux.org/vuln/CVE-2018-9336
debian unimportant CVE-2018-9336 unimportant priority: Debian including 1 source packages (openvpn), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-9336
suse medium CVE-2018-9336 severity moderate: SUSE including 36 source package names (openvpn, openvpn-2.4.3-5.3.19, …), 65 product×package rows across 28 product lines (SUSE Linux Enterprise Desktop 12 SP3, SUSE Linux Enterprise Module for Basesystem 15, … (28 product lines)): Fixed 44, Known Not Affected 21. https://www.suse.com/security/cve/CVE-2018-9336/
ubuntu medium CVE-2018-9336 medium priority: Ubuntu including 1 source packages (openvpn), 5 status rows across 5 suites (artful, bionic, trusty, upstream, xenial): not-affected 4, needs-triage 1. https://ubuntu.com/security/CVE-2018-9336

Affected software / configurations for CVE-2018-9336

Vendor Product Version Raw CPE
openvpn openvpn >= 2.4.0, < 2.4.6 cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
slackware slackware_linux 13.0 cpe:2.3:o:slackware:slackware_linux:13.0:*:*:*:*:*:*:*
slackware slackware_linux 13.1 cpe:2.3:o:slackware:slackware_linux:13.1:*:*:*:*:*:*:*
slackware slackware_linux 13.37 cpe:2.3:o:slackware:slackware_linux:13.37:*:*:*:*:*:*:*
slackware slackware_linux 14.0 cpe:2.3:o:slackware:slackware_linux:14.0:*:*:*:*:*:*:*
slackware slackware_linux 14.1 cpe:2.3:o:slackware:slackware_linux:14.1:*:*:*:*:*:*:*

References for CVE-2018-9336

cvelogic Threat Intelligence