CVE-2019-15690
libvncserver: HandleCursorShape() integer overflow resulting in heap-based buffer overflow
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · December 20, 2019
Updated · June 27, 2026
Description
A flaw was found in libvncserver. An integer overflow within the HandleCursorShape() function can be exploited to cause a heap-based buffer overflow by tricking a user or application using libvncserver to connect to an unstrusted server and subsequently send cursor shapes with specially crafted dimensions. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Libvncserver should not be used to connect to untrusted server.
CVSS / CWE
CVSS 3.1 · 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-190 · Integer Overflow or Wraparound