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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (16.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Uvnc Ultravnc Launcher — versions 1.2.2.4
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/46703 (exploit)
- www.uvnc.com/ (product)
- www.uvnc.com/downloads/ultravnc/126-download-ultravnc-1224.html (product)
- www.vulncheck.com/advisories/ultravnc-launcher-denial-of-service-buffer-overflow (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.