CVE-2018-9336: openvpn Double Free
Vulnerability summary
CVE-2018-9336 is a high (CVSS 7.8) Double Free vulnerability in openvpn. EPSS estimates a 0.59% chance of exploitation in the next 30 days, higher than 46.9% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 01-05-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated7.8HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.59%
Chance of exploitation in the next 30 days
Percentile
47%
Versus all other CVEs
30-day change
-0.01 pp
From 0.60% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (tenable.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- openvpn≥ 2.4.0, < 2.4.6-r0
Mageia1 product
- openvpn< 2.4.4-1.1.mga6
Openvpn1 product
- openvpn≥ 2.4.0, < 2.4.6
Slackware1 product
- slackware_linuxEOL13.0 | 13.1 | 13.37 | 14.0 | 14.1
Suse1 product
- openvpn&distro=SUSE Linux Enterprise Module for Basesystem 15< 2.4.3-5.3.19
5 vendors · 5 products
References
12 links- www.slackware.com/security/viewer.php?l=slackware-security&y=2018&m=slackware-security.568761Vendor AdvisoryX Refsource SLACKWAREMailing ListThird Party Advisory
- github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79bX Refsource CONFIRMPatchThird Party Advisory
- community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24X Refsource CONFIRMRelease NotesVendor Advisory