CVE-2021-34803

CVE-2021-34803 is a high-severity vulnerability in Teamviewer with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-427.

Key facts

Description

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

Frequently asked questions

What is CVE-2021-34803?
TeamViewer before 14.7.48644 on Windows loads untrusted DLLs in certain situations.
How severe is CVE-2021-34803?
CVE-2021-34803 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-34803 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34803?
CVE-2021-34803 affects Teamviewer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34803?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-34803 published?
CVE-2021-34803 was published on 2021-06-16 and last updated on 2026-06-17.

References

Affected products (1)

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