CVE-2019-25600
MEDIUMUltraVNC Viewer 1.2.2.4 Denial of Service via Buffer Overflow
Title source: cnaDescription
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.
Exploits (1)
exploitdb
WORKING POC
by Victor Mondragón · pythondoswindows
https://www.exploit-db.com/exploits/46702
Scores
CVSS v3
6.5
EPSS
0.0005
EPSS Percentile
16.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-787
Status
published
Products (1)
Uvnc/UltraVNC Viewer
1.2.2.4
Published
Mar 22, 2026
Tracked Since
Mar 22, 2026