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TeamviewerApplication

CVE-2021-34803

HIGH · 7.8 CVSS v3.1 Published 2021-06-16
Fix available
A fix is available. Upgrade to 9.0.259145 / 10.0.259144 or later.
See remediation →
81/100
Remediation priority · High
No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
TeamViewer before 14.7.48644 on Windows loads untrusted DLLs in certain situations.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

TeamViewer before version 14.7.48644 on Windows is vulnerable to DLL hijacking, loading untrusted dynamic link libraries from certain locations. This allows a local attacker to execute arbitrary code via a specially crafted DLL that gets loaded by the application.

MitigationUpdate TeamViewer to version 14.7.48644 or later. Ensure no malicious DLLs exist in directories from which TeamViewer loads libraries.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
TeamviewerApplication
Affected:< 9.0.259145>= 10.0.2551, < 10.0.259144>= 11.0.90968, < 11.0.259143>= 12.0.92876, < 12.0.259142>= 13.0.5058, < 13.2.36222>= 14.0.8346, < 14.2.56678>= 14.3.4730, < 14.7.48644

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Find installed TeamViewer version
    Open TeamViewer, go to Help > About TeamViewer, or right-click TeamViewer.exe in the installation directory and select Properties > Details to view the version/build number
    Affected if Version displayed is lower than 14.7.48644 and matches one of the affected version ranges (< 9.0.259145; 10.0.2551 to 10.0.259143; 11.0.90968 to 11.0.259142; 12.0.92876 to 12.0.259141; 13.0.5058 to 13.2.36221; 14.0.8346 to 14.2.56677; or 14.3.4730 to 14.7.48643)
  2. Verify TeamViewer installation directory
    Locate the TeamViewer installation folder (commonly C:\Program Files\TeamViewer or C:\Program Files (x86)\TeamViewer) and confirm TeamViewer.exe exists
    Affected if TeamViewer is installed and the executable is present in the filesystem
  3. Confirm Windows platform
    Verify the operating system is Windows (this vulnerability affects TeamViewer on Windows only)
    Affected if Running on Windows with an affected TeamViewer version installed

The system is affected if TeamViewer for Windows is installed with a version less than 14.7.48644 that falls within the listed vulnerable version ranges.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Upgrade available Upgrade to 9.0.259145 / 10.0.259144 / 11.0.259143 or later
Fixed in 9.0.25914510.0.25914411.0.259143
Interim mitigation

Update TeamViewer to version 14.7.48644 or later. Ensure no malicious DLLs exist in directories from which TeamViewer loads libraries.

Fix this in Teamviewer Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-34803 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data