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CVE-2020-37134— UltraVNC Viewer 1.2.4.0 - 'VNCServer' Denial of Service

Quick assessment

Affected
UltraVNC Team UltraVNC Viewer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

UltraVNC Viewer是UltraVNC公司的一个远程桌面客户端。 UltraVNC Viewer 1.2.4.0版本存在安全漏洞，该漏洞源于VNC服务器输入处理不当，可能导致应用程序崩溃。

CVSS 7.5 · High EPSS 0.41% · P34
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I. Basic Information for CVE-2020-37134

Vulnerability Information
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Vulnerability Title
UltraVNC Viewer 1.2.4.0 - 'VNCServer' Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
UltraVNC Viewer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UltraVNC Viewer是UltraVNC公司的一个远程桌面客户端。 UltraVNC Viewer 1.2.4.0版本存在安全漏洞，该漏洞源于VNC服务器输入处理不当，可能导致应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
UltraVNC Team UltraVNC Viewer 1.2.4.0 -

II. Public POCs for CVE-2020-37134

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III. Intelligence Information for CVE-2020-37134

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Same Patch Batch · UltraVNC Team · 2026-02-05 · 3 CVEs total

CVE-2020-37133 7.5 HIGH UltraVNC Launcher 1.2.4.0 - 'RepeaterHost' Denial of Service
CVE-2020-37132 6.2 MEDIUM UltraVNC Launcher 1.2.4.0 - 'Password' Denial of Service

IV. Related Vulnerabilities

Same product: UltraVNC Viewer
Same vendor: UltraVNC Team
Same weakness: CWE-770

V. Comments for CVE-2020-37134

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