CVE-2021-34859

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TeamViewer 15.16.8.0. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of TVS files. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-13697.

• CWE-119
• CWE-787

• https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1Patch, Vendor Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-1003/Third Party Advisory, VDB Entry
• https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1Patch, Vendor Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-1003/Third Party Advisory, VDB Entry

Published

Oct 25, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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