How severe is CVE-2018-16550?

CVE-2018-16550 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-16550 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-16550?

CVE-2018-16550 affects Teamviewer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-16550?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-16550 published?

CVE-2018-16550 was published on 2018-09-05 and last updated on 2026-06-17.

CVE-2018-16550

CVE-2018-16550 is a critical-severity vulnerability in Teamviewer with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 5.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Teamviewer
Published: 2018-09-05
Last modified: 2026-06-17

Description

TeamViewer 10.x through 13.x allows remote attackers to bypass the brute-force authentication protection mechanism by skipping the "Cancel" step, which makes it easier to determine the correct value of the default 4-digit PIN.

Frequently asked questions

What is CVE-2018-16550?: TeamViewer 10.x through 13.x allows remote attackers to bypass the brute-force authentication protection mechanism by skipping the "Cancel" step, which makes it easier to determine the correct value of the default 4-digit PIN.
How severe is CVE-2018-16550?: CVE-2018-16550 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-16550 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-16550?: CVE-2018-16550 affects Teamviewer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-16550?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-16550 published?: CVE-2018-16550 was published on 2018-09-05 and last updated on 2026-06-17.

References

https://twitter.com/vah_13/status/1036894081350291457

Affected products (1)

cpe:2.3:a:teamviewer:teamviewer:*:*:*:*:*:*:*:*

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