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CVE Vulnerability Details :
CVE-2020-37134
PUBLISHED
More InfoOfficial Page
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
View Known Exploited Vulnerability (KEV) details
Published At-05 Feb, 2026 | 16:13
Updated At-05 Feb, 2026 | 18:43
Rejected At-
▼CVE Numbering Authority (CNA)
UltraVNC Viewer 1.2.4.0 - 'VNCServer' Denial of Service

UltraVNC Viewer 1.2.4.0 contains a denial of service vulnerability that allows attackers to crash the application by manipulating VNC Server input. Attackers can generate a malformed 256-byte payload and paste it into the VNC Server connection dialog to trigger an application crash.

Affected Products
Vendor
UltraVNC Team
Product
UltraVNC Viewer
Versions
Affected
  • 1.2.4.0
Problem Types
TypeCWE IDDescription
CWECWE-770Allocation of Resources Without Limits or Throttling
Type: CWE
CWE ID: CWE-770
Description: Allocation of Resources Without Limits or Throttling
Metrics
VersionBase scoreBase severityVector
4.04.6MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 4.0
Base score: 4.6
Base severity: MEDIUM
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
chuyreds
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.exploit-db.com/exploits/48291
exploit
https://www.uvnc.com/
product
https://www.vulncheck.com/advisories/ultravnc-viewer-vncserver-denial-of-service
third-party-advisory
Hyperlink: https://www.exploit-db.com/exploits/48291
Resource:
exploit
Hyperlink: https://www.uvnc.com/
Resource:
product
Hyperlink: https://www.vulncheck.com/advisories/ultravnc-viewer-vncserver-denial-of-service
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found