CVE-2019-8261

UltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC code inside client CoRRE...

9.8 Critical

UltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC code inside client CoRRE decoder, caused by multiplication overflow. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1200.

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

2.24%Up 1.4 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Record: CVE-2019-8261
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-125
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-8261
Weakness: CWE-125
Updated: 2026-11-02

EUVDEUVD-2019-17659 No score

Record: EUVD-2019-17659
Updated: 2026-11-03

GitHub AdvisoriesGHSA-frcm-7p38-7j57 9.8

UltraVNC revision 1199 has a out-of-bounds read vulnerability in VNC code inside client CoRRE...

Record: GHSA-frcm-7p38-7j57
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-2019-8261 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 2.24%, the 82nd percentile. No source names a fixed version.