CVE-2021-34858
mediumpriority · track · 32EPSS 0.038 · 90 %ileEUUSEPSS · scored 2026-10-26
This vulnerability allows remote attackers to execute arbitrary code on affected installations of TeamViewer. 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 read past the end of an allocated structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-13606.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–7.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (9)
External citations — patches, advisories, analysis.
- https://community.teamviewer.com/Chinese/discussion/117856/2021%E5%B9%B48%E6%9C%88%E6%9B%B4%E6%96%B0-%E5%AE%89%E5%85%A8%E8%A1%A5%E4%B8%81Patchcnnvd
- https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1cnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2021-34858cnnvd
- https://vigilance.fr/vulnerability/TeamViewer-three-vulnerabilities-36175cnnvd
- https://www.zerodayinitiative.com/advisories/ZDI-21-1001/cnnvd
- https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1enisa_euvd
- https://www.zerodayinitiative.com/advisories/ZDI-21-1001/enisa_euvd
- https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1Vendor Advisorynvd
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