Memory corruption in TeamViewer
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| TeamViewer | TeamViewer | 15.16.8.0 | — | No fix listed | CNA |
- TeamViewer VendorTeamViewer Affected 15.16.8.0 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:teamviewer:teamviewer:15.16.8.0:*:*:*:*:*:*:* | 15.16.8.0 | Vulnerable | TeamViewer |
- cpe:2.3:a:teamviewer:teamviewer:15.16.8.0:*:*:*:*:*:*:* Versions 15.16.8.0 Vulnerable ·TeamViewer
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34859
- 2026-10-03 Alias added: GHSA-26xh-wmc4-35qp
References
More Teamviewer vulnerabilities
- TI-2019-13681 TeamViewer Desktop through 14.7.1965 allows a bypass of remote-login access control… KEVCVSS 3.1HIGH 7.0
- TI-2020-10745 TeamViewer Desktop for Windows before 15.8.3 does not properly quote its custom URI… CVSS 3.1HIGH 8.8
- TI-2010-02989 Untrusted search path vulnerability in TeamViewer 5.0.8703 and earlier allows local… CVSS 2.0HIGH 9.3
- TI-2018-11870 TeamViewer 10.x through 13.x allows remote attackers to bypass the brute-force… CVSS 3.0CRITICAL 9.8
- TI-2019-13268 In Omron CX-Supervisor, Versions 3.5 (12) and prior, Omron CX-Supervisor ships with… CVSS 3.1HIGH 8.8
- TI-2021-13848 Out-of-bounds read in TeamViewer CVSS 3.1HIGH 7.8
Sources
- CVE-2021-34859 · CVE Program
- CVE-2021-34859 · NVD
- FIRST EPSS
- GHSA-26xh-wmc4-35qp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences