Medium severity6.5NVD Advisory· Published Mar 22, 2026· Updated Apr 16, 2026

CVE-2019-25600

Description

UltraVNC Viewer 1.2.2.4 contains a denial of service vulnerability that allows attackers to crash the application by supplying an oversized string to the VNC Server input field. Attackers can paste a malicious string containing 256 repeated characters into the VNC Server field and click Connect to trigger a buffer overflow that crashes the viewer.

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

www.exploit-db.com/exploits/46702nvd
www.uvnc.comnvd
www.uvnc.com/downloads/ultravnc/126-download-ultravnc-1224.htmlnvd
www.vulncheck.com/advisories/ultravnc-viewer-denial-of-service-via-buffer-overflownvd

News mentions

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