CVE-2021-34858 json
This vulnerability allows remote attackers to execute arbitrary code on affected installations of TeamViewer.
published 2022-01-13 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21505
- cvss
- 7.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.7%
- EPSS 3.7% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- teamviewer teamviewer 15.21.2
Exploit prediction
3.68% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 7.8 | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- TeamViewer TeamViewer
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
community.teamviewer.com
/English/discussion/117794/august-updates-security-patches/p1
vendor-advisory
-
zerodayinitiative.com
/advisories/ZDI-21-1001/
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-34858
- NVD CVE-2021-34858
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