CVE-2019-25601

UltraVNC Launcher 1.2.2.4 Denial of Service Buffer Overflow

Published Mar 22, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

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.

Analysis

Technical impact

UltraVNC Launcher 1.2.2.4 contains a buffer overflow in the Path vncviewer.exe property field that lets a local attacker crash the application by entering an overly long string, resulting in a denial of service for legitimate users.

Affected Systems

The vulnerable product is UltraVNC Launcher version 1.2.2.4 from the Uvnc vendor.

Risk and Exploitability

The CVSS score of 6.9 indicates moderate severity, and the EPSS value is unavailable; the vulnerability is not listed in the KEV catalog. The exploit requires local user access and a crafted input via the Properties dialog, so its potential impact is limited to systems where an attacker can run the application locally and supply the attack payload.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Uvnc

UltraVNC Launcher

affected

Version	Status	Constraints
`1.2.2.4`	affected	—

No data.

Vendor Product Versions

Uvnc

Ultravnc Launcher

Version	Status	Scheme	Platform
`1.2.2.4`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade UltraVNC Launcher to a version later than 1.2.2.4 if an update is available.
If no update exists, uninstall the vulnerable application.
Restrict local user permissions to prevent unauthorized input into the Properties dialog.
Monitor application logs for unexpected crashes and apply future security patches as released.

Generated by OpenCVE AI on March 22, 2026 at 14:41 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.274% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
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

History

Oct 1, 2026 10:00 PM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Uvnc ultravnc
CPEs		cpe:2.3:a:uvnc:ultravnc:1.2.2.4:::::::*
Vendors & Products		Uvnc ultravnc

Mar 23, 2026 5:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Mar 23, 2026 10:00 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Uvnc Uvnc ultravnc Launcher
Vendors & Products		Uvnc Uvnc ultravnc Launcher

Mar 22, 2026 1:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		UltraVNC Launcher 1.2.2.4 Denial of Service Buffer Overflow
Weaknesses		CWE-787
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
Metrics		cvssV3_1 `{'score': 6.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}`