Critical severity · published Dec 31, 2016
CVE-2016-9941
Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute…
9.8
CVSS
3.7%
EPSS
No
On KEV
Description
Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.7% · higher than 90% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Libvncserver · Libvncserver Project
through 0.9.10 · source: NVD
Affected product
LI
Libvncserver
Libvncserver Project
More from Libvncserver
9.8
CVE-2017-18922
It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames
9.8
CVE-2018-7225
An issue was discovered in LibVNCServer through 0.9.11
9.8
CVE-2016-9942
Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute…
8.1
CVE-2026-32853
LibVNCServer UltraZip Encoding Heap Out-of-bounds Read
7.5
CVE-2026-32854
LibVNCServer httpd proxy NULL Pointer Dereference