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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.

PUBLISHED Reserved 2026-03-22 | Published 2026-03-22 | Updated 2026-03-23 | Assigner VulnCheck




MEDIUM: 6.9CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
MEDIUM: 6.2CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

Out-of-bounds Write

Product status

1.2.2.4
affected

Credits

Victor Mondragón finder

References

www.exploit-db.com/exploits/46703 (ExploitDB-46703) exploit

www.uvnc.com/ (Official Product Homepage) product

www.uvnc.com/...ads/ultravnc/126-download-ultravnc-1224.html (Product Reference) product

www.vulncheck.com/...ncher-denial-of-service-buffer-overflow (VulnCheck Advisory: UltraVNC Launcher 1.2.2.4 Denial of Service Buffer Overflow) third-party-advisory

cve.org (CVE-2019-25601)

nvd.nist.gov (CVE-2019-25601)

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