Security readout for executives and security teams
Plain-English summary
CVE-2019-25601 affects UltraVNC Launcher 1.2.2.4. A local user can enter an overly long value in a launcher property field and crash the application. This is primarily an availability risk, not evidence of data theft or remote compromise.
Executive priority
Treat as a medium-priority availability issue. It is not presented as remote code execution or active exploitation, but it can disrupt remote administration tooling on affected endpoints. Address during normal vulnerability management, faster for critical support systems.
Technical view
The issue is a buffer overflow, categorized as CWE-787, in the Path vncviewer.exe property field of UltraVNC Launcher 1.2.2.4. The published CVSS v4 score is 6.9 with local attack vector and high vulnerable-system availability impact. Sources describe denial of service through application crash.
Likely exposure
Exposure is limited to systems running UltraVNC Launcher 1.2.2.4 where an attacker has local access to interact with the launcher properties. Remote network exposure is not indicated in the provided sources.
Exploitation context
A public ExploitDB reference exists, but the source bundle does not show CISA KEV listing or confirmed active exploitation. The described impact is local denial of service by crashing the application.
Researcher notes
The record is unusual because the CVE is dated 2019 but published in 2026. Evidence identifies a local denial-of-service buffer overflow in version 1.2.2.4. The provided sources do not name a fixed version or vendor patch.
Mitigation direction
- Identify endpoints running UltraVNC Launcher 1.2.2.4.
- Check UltraVNC vendor guidance for updated versions or replacement recommendations.
- Remove UltraVNC Launcher where it is not operationally required.
- Limit local interactive access to trusted users on affected systems.
- Prioritize systems where UltraVNC supports critical remote administration workflows.
Validation and detection
- Confirm whether UltraVNC Launcher 1.2.2.4 is installed.
- Review software inventory and endpoint management records for the affected version.
- Validate whether the launcher is actively used in business operations.
- Check vendor download and advisory pages for newer guidance.
- Avoid reproducing the crash on production systems.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2019-25601 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-46703CVE reference · exploit
- Official Product HomepageCVE reference · product
- Product ReferenceCVE reference · product
- VulnCheck Advisory: UltraVNC Launcher 1.2.2.4 Denial of Service Buffer OverflowCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.