CVE-2020-37134

UltraVNC Viewer 1.2.4.0 - 'VNCServer' Denial of Service

CVSS 4.6 MEDIUMEPSS 0.4%CWE-770

Vexday Risk Score

13Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 4.6EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

05 feb 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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.

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

Productos afectados

UltraVNC Team · UltraVNC Viewer

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Referencias

https://www.exploit-db.com/exploits/48291 https://www.uvnc.com/https://www.vulncheck.com/advisories/ultravnc-viewer-vncserver-denial-of-service