CVE-2019-8262

UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code...

9.8 Critical

UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code inside Ultra decoder, which results in code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1204.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

4.84%Up 3.4 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2019-8262
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-122, CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-8262
Weakness: CWE-122
Updated: 2026-11-02

EUVDEUVD-2019-17660 No score

Record: EUVD-2019-17660
Updated: 2026-11-03

GitHub AdvisoriesGHSA-28h7-jgqq-qp89 9.8

UltraVNC revision 1203 has multiple heap buffer overflow vulnerabilities in VNC client code...

Record: GHSA-28h7-jgqq-qp89
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-8262 is a critical vulnerability (CVSS 9.8) in Ultravnc, published March 5, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.84%, the 92nd percentile. No source names a fixed version.