CVE-2019-25600
UltraVNC Viewer 1.2.2.4 Denial of Service via Buffer Overflow
- State
- Published
- Severity
- 7.1 High
- Published
- Mar 22, 2026
- Updated
- Mar 24, 2026
- Reserved
- Mar 22, 2026
Description
UltraVNC Viewer 1.2.2.4 contains a denial of service vulnerability that allows attackers to crash the application by supplying an oversized string to the VNC Server input field. Attackers can paste a malicious string containing 256 repeated characters into the VNC Server field and click Connect to trigger a buffer overflow that crashes the viewer.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
UltraVNC ViewerUvnc |
|
References
- ExploitDB-46702exploit
- Official Product Homepageproduct
- Product Referenceproduct
- VulnCheck Advisory: UltraVNC Viewer 1.2.2.4 Denial of Service via Buffer Overflowthird-party-advisory
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