What’s Vulnerable › Vulnerabilities

CVE-2019-25601: UltraVNC Launcher 1.2.2.4 Denial of Service Buffer Overflow

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-22 · updated 2026-06-17
• Weakness: CWE-787

Description

UltraVNC Launcher 1.2.2.4 contains a buffer overflow vulnerability in the Path vncviewer.exe property field that allows local attackers to crash the application by supplying an excessively long string. Attackers can input a 300-byte payload of repeated characters through the Properties dialog to trigger a denial of service condition.

Affected products

• Uvnc UltraVNC Launcher: 1.2.2.4

References

• https://www.exploit-db.com/exploits/46703
• https://www.uvnc.com/
• https://www.uvnc.com/downloads/ultravnc/126-download-ultravnc-1224.html
• https://www.vulncheck.com/advisories/ultravnc-launcher-denial-of-service-buffer-overflow

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