CVE-2018-20750
libvncserver: Heap out-of-bounds write in rfbserver.c in rfbProcessFileTransferReadBuffer() allows for potential code execution (Incomplete fix for CVE-2018-15127)
Severity
ImportantRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · January 6, 2019
Updated · November 22, 2025
Description
A flaw was found in libvncserver. An incomplete fix for CVE-2018-15127 leaves open an out-of-bounds write vulnerability in code for the file transfer extension. This vulnerability can be remotely exploited. 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
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 7.5CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-122 · Heap-based Buffer Overflow