CVE-2019-8264

UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder...

9.8 Critical

UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. This vulnerability has 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

3.13%Up 1.7 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2019-8264
CVSS 3.0: 9.8 CriticalCVSS:3.0/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-788, CWE-125, CWE-787
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-8264
Weakness: CWE-788
Updated: 2026-11-02

EUVDEUVD-2019-17662 No score

Record: EUVD-2019-17662
Updated: 2026-11-03

GitHub AdvisoriesGHSA-mv4r-mvcw-2mxv 9.8

UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder...

Record: GHSA-mv4r-mvcw-2mxv
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-125
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-2019-8264 is a critical vulnerability (CVSS 9.8) in Kaspersky Lab Ultravnc, published March 8, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.13%, the 87th percentile. No source names a fixed version.