Privilege Escalation via Symbolic Link Spoofing in TeamViewer Client
Priority LOW 21CWE-59Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-59 and the CVSS impact.
Summary
Improper handling of symbolic links in the TeamViewer Full Client and Host for Windows — in versions prior to 15.70 of TeamViewer Remote and Tensor — allows an attacker with local, unprivileged access to a device lacking adequate malware protection to escalate privileges by spoofing the update file path. This may result in unauthorized access to sensitive information.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00141 3rd percentileScored 2026-11-07
Fix Fixed Full Client (TeamViewer): 15.70Host (TeamViewer): 15.70
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| TeamViewer | Full Client | 11.0.0 to before 15.70 | 15.70 | Patch available | CNA |
| TeamViewer | Host | 11.0.0 to before 15.70 | 15.70 | Patch available | CNA |
- Full Client VendorTeamViewer Affected 11.0.0 to before 15.70 Fixed in 15.70 Patch available CNA
- Host VendorTeamViewer Affected 11.0.0 to before 15.70 Fixed in 15.70 Patch available CNA
Remediation
- Fix · CNA Full Client (TeamViewer) Fixed in 15.70
- Fix · CNA Host (TeamViewer) Fixed in 15.70
Timeline
- 2026-10-02 Threatist record created from CVE-2025-41421
- 2026-10-03 Alias added: GHSA-m856-89mj-r6pg
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-2021-13849 Memory corruption in TeamViewer CVSS 3.1HIGH 8.8
- TI-2018-11870 TeamViewer 10.x through 13.x allows remote attackers to bypass the brute-force… CVSS 3.0CRITICAL 9.8
- TI-2025-28565 File Hash Validation Bypass in NomadBranch.exe CVSS 3.1HIGH 8.8
Sources
- CVE-2025-41421 · CVE Program
- CVE-2025-41421 · NVD
- FIRST EPSS
- GHSA-m856-89mj-r6pg · GitHub Advisory Database · CC BY 4.0
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