CVE-2021-41380

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-41380
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

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

4.3 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:M/Au:N/C:N/I:N/A:P

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References
Link Resource
https://gist.github.com/totaam/a90f2bb40f5b693ccec0ae903d021b03 Exploit Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:realvnc:vnc_viewer:6.21.406:*:*:*:*:*:*:*
History

07 Nov 2023, 03:38

Type Values Removed Values Added
Summary ** 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. 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

28 Sep 2021, 19:25

Type Values Removed Values Added
CPE cpe:2.3:a:realvnc:vnc_viewer:6.21.406:*:*:*:*:*:*:*
References (MISC) https://gist.github.com/totaam/a90f2bb40f5b693ccec0ae903d021b03 - (MISC) https://gist.github.com/totaam/a90f2bb40f5b693ccec0ae903d021b03 - Exploit, Third Party Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : 4.3
v3 : 6.5
CWE CWE-20

24 Sep 2021, 16:15

Type Values Removed Values Added
Summary RealVNC Viewer 6.21.406 allows remote VNC servers to cause a denial of service (application crash) via crafted RFB protocol data. ** 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.

17 Sep 2021, 20:15

Type Values Removed Values Added
New CVE
Information

Published : 2021-09-17 20:15

Updated : 2024-05-17 02:01

NVD link : CVE-2021-41380

Mitre link : CVE-2021-41380

CVE.ORG link : CVE-2021-41380

JSON object : View

Products Affected

realvnc

  • vnc_viewer
CWE
CWE-20

Improper Input Validation