Vulnerability Details : CVE-2021-42785
Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.
Published
2021-11-23 22:15:08
Updated
2021-11-29 14:23:43
Vulnerability category: Overflow
Products affected by CVE-2021-42785
- cpe:2.3:a:tightvnc:tightvnc:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-42785
0.99%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 75 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-42785
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-42785
-
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.Assigned by:
- cve_disclosure@tech.gov.sg (Secondary)
- nvd@nist.gov (Primary)
References for CVE-2021-42785
-
https://www.tightvnc.com/whatsnew.php
TightVNC: What's New in TightVNCRelease Notes;Vendor Advisory
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