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Vulnerability Details : CVE-2021-41380

** DISPUTED ** RealVNC Viewer 6.21.406 allows remote VNC servers to cause a denial of service (application crash) via crafted RFB protocol data. NOTE: It is asserted that this issue requires social engineering a user into connecting to a fake VNC Server. The VNC Viewer application they are using will then hang, until terminated, but no memory leak occurs - the resources are freed once the hung process is terminated and the resource usage is constant during the hang. Only the process that is connected to the fake Server is affected. This is an application bug, not a security issue.
Publish Date : 2021-09-17 Last Update Date : 2021-09-28
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- CVSS Scores & Vulnerability Types

CVSS Score
4.3
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 20

- Products Affected By CVE-2021-41380

# Product Type Vendor Product Version Update Edition Language
1 Application Realvnc Vnc Viewer 6.21.406 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Realvnc Vnc Viewer 1

- References For CVE-2021-41380

https://gist.github.com/totaam/a90f2bb40f5b693ccec0ae903d021b03

- Metasploit Modules Related To CVE-2021-41380

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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