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.

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 payloa…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (4.5th 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)

CWE-787 — Out-of-bounds Write

References

ExploitDB-46703 (exploit)
Official Product Homepage (product)
Product Reference (product)
VulnCheck Advisory: UltraVNC Launcher 1.2.2.4 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.