High severity7.5NVD Advisory· Published Feb 5, 2026· Updated Apr 15, 2026

CVE-2020-37134

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Ultravnc/Vnc Viewerllm-fuzzy
Range: = 1.2.4.0

Patches

Vulnerability mechanics

References

www.exploit-db.com/exploits/48291nvd
www.uvnc.comnvd
www.vulncheck.com/advisories/ultravnc-viewer-vncserver-denial-of-servicenvd

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