Buffer overflow in Uvnc Ultravnc Launcher
CVE-2019-25601
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.
Vulnerability class: Buffer Overflow
EPSS: 0.003 (18.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Uvnc Ultravnc Launcher — versions 1.2.2.4
Weakness classification (CWE)
References
- disclosure@vulncheck.com (exploit)
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2019-25601?
- CVE-2019-25601 is a medium-severity vulnerability in Uvnc Ultravnc Launcher, classified under Out-of-bounds Write. CVSS score: 6.2/10. Published 2026-03-22.
- How severe is CVE-2019-25601?
- Medium severity. CVSS v3 base score is 6.2 out of 10.