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CVE-2019-20840

Published: 17 June 2020

An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
libvncserver
Launchpad, Ubuntu, Debian
bionic
Released (0.9.11+dfsg-1ubuntu1.3)
eoan Ignored
(end of life)
trusty Does not exist

impish Not vulnerable
(0.9.13+dfsg-1)
focal Not vulnerable

groovy Not vulnerable
(0.9.13+dfsg-1)
hirsute Not vulnerable
(0.9.13+dfsg-1)
jammy Not vulnerable
(0.9.13+dfsg-1)
kinetic Not vulnerable
(0.9.13+dfsg-1)
lunar Not vulnerable
(0.9.13+dfsg-1)
upstream Needs triage

xenial
Released (0.9.10+dfsg-3ubuntu0.16.04.5)
mantic Not vulnerable
(0.9.13+dfsg-1)
Patches:
upstream: https://github.com/LibVNC/libvncserver/commit/0cf1400c61850065de590d403f6d49e32882fd76
veyon
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Ignored
(end of life)
focal Needs triage

trusty Does not exist

upstream Needs triage

xenial Does not exist

hirsute Ignored
(end of life)
groovy Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
impish Ignored
(end of life)
jammy Needs triage

mantic Needs triage

lunar Ignored
(end of life, was needs-triage)
x11vnc
Launchpad, Ubuntu, Debian
bionic Needs triage

eoan Ignored
(end of life)
focal Needs triage

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
kinetic Ignored
(end of life, was needs-triage)
impish Ignored
(end of life)
xenial Needs triage

jammy Needs triage

trusty Needs triage

upstream Needs triage

mantic Needs triage

lunar Ignored
(end of life, was needs-triage)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H