High severity · published Jan 13, 2022
CVE-2021-34858
This vulnerability allows remote attackers to execute arbitrary code on affected installations of TeamViewer
7.8
CVSS
3.8%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.8% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TE
Teamviewer · Teamviewer
before 15.21.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34858
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34858
Vendor Advisory
https://community.teamviewer.com/English/discussion/117794/august-updates-security-patches/p1
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1001/
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