TigerVNC version prior to 1.10.1 is vulnerable to heap buffer overflow, which could be triggered from DecodeManager::decodeRect. Vulnerability occurs due to the signdness error in processing MemOutStream. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00039.html
https://github.com/CendioOssman/tigervnc/commit/0943c006c7d900dfc0281639e992791d6c567438
Source: MITRE
Published: 2019-12-26
Updated: 2020-10-16
Type: CWE-787
Base Score: 6.5
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8
Severity: MEDIUM
Base Score: 7.2
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.2
Severity: HIGH