CVE-2019-25601 | UltraVNC Launcher 1.2.2.4 Properties Dialog vncviewer.exe out-of-bounds write (Exploit 46703 / EDB-46703)

VDB-352449 · CVE-2019-25601 · EXPLOIT 46703 ULTRAVNC LAUNCHER 1.2.2.4 PROPERTIES DIALOG VNCVIEWER.EXE OUT-OF-BOUNDS WRITE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.6 $0-$5k 2.20+ 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). Productinfo Type Connectivity Software Vendor UltraVNC Name Launcher Version 1.2.2.4 License open-source 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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: 99:D9E:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸