CVE-2019-25600
Medium · 6.5CVSS
6.5
EPSS
0.7%
Published
Mar 22, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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