UltraVNC Launcher 1.2.2.4 Properties Dialog vncviewer.exe out-of-bounds write

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in UltraVNC Launcher 1.2.2.4. This impacts an unknown function of the file vncviewer.exe of the component Properties Dialog. Performing a manipulation results in out-of-bounds write. This vulnerability is cataloged as CVE-2019-25601. The attack must be initiated from a local position. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in UltraVNC Launcher 1.2.2.4. This affects some unknown processing of the file vncviewer.exe of the component Properties Dialog. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. The summary by CVE is:

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.

The weakness was shared by Victor Mondragón as 46703. The advisory is shared at exploit-db.com. This vulnerability is uniquely identified as CVE-2019-25601 since 03/22/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details and a public exploit are known.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (46703). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Vendor

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Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.6

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.2
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Exploit-DB: 🔒

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/22/2026 Advisory disclosed
03/22/2026 +0 days CVE reserved
03/22/2026 +0 days VulDB entry created
03/22/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: 46703
Researcher: Victor Mondragón
Status: Not defined

CVE: CVE-2019-25601 (🔒)
GCVE (CVE): GCVE-0-2019-25601
GCVE (VulDB): GCVE-100-352449
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/22/2026 15:54
Changes: 03/22/2026 15:54 (82)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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