What’s Vulnerable › Vulnerabilities
CVE-2021-34803
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-06-16 · updated 2026-06-17
- Weakness: CWE-427
Description
TeamViewer before 14.7.48644 on Windows loads untrusted DLLs in certain situations.
Affected products
- TeamViewer: before 9.0.259145; from 10.0.2551 before 10.0.259144; from 11.0.90968 before 11.0.259143; from 12.0.92876 before 12.0.259142; from 13.0.5058 before 13.2.36222; from 14.0.8346 before 14.2.56678 — fixed in 10.0.259144, 11.0.259143, 12.0.259142, 13.2.36222, 14.2.56678, 14.7.48644
How to fix
Upgrade to a fixed version: TeamViewer 10.0.259144, 11.0.259143, 12.0.259142, 13.2.36222. Check the vendor advisory for mitigations.
References
- https://community.teamviewer.com/English/discussion/111147/windows-v9-0-259145
- https://community.teamviewer.com/English/discussion/111149/windows-v10-0-259144
- https://community.teamviewer.com/English/discussion/111150/windows-v11-0-259143
- https://community.teamviewer.com/English/discussion/111151/windows-v12-0-259142
- https://community.teamviewer.com/English/discussion/111152/windows-v13-2-36222
- https://community.teamviewer.com/English/discussion/111153/windows-v14-2-56678
- https://community.teamviewer.com/English/discussion/111154/windows-v14-7-48644
- https://community.teamviewer.com/English/discussion/111147/windows-v9-0-259145
- https://community.teamviewer.com/English/discussion/111149/windows-v10-0-259144
- https://community.teamviewer.com/English/discussion/111150/windows-v11-0-259143
- https://community.teamviewer.com/English/discussion/111151/windows-v12-0-259142
- https://community.teamviewer.com/English/discussion/111152/windows-v13-2-36222
Get alerted when CVE-2021-34803 or the next vulnerability affects your stack