CVE-2018-20749

Publication date 30 January 2019

Last updated 25 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

Description

LibVNC before 0.9.12 contains a heap out-of-bounds write vulnerability in libvncserver/rfbserver.c. The fix for CVE-2018-15127 was incomplete.

Status

Package Ubuntu Release Status
libvncserver 20.04 LTS focal
Not affected
19.04 disco
Not affected
18.10 cosmic
Fixed 0.9.11+dfsg-1.1ubuntu0.1
18.04 LTS bionic
Fixed 0.9.11+dfsg-1ubuntu1.1
16.04 LTS xenial
Fixed 0.9.10+dfsg-3ubuntu0.16.04.3
14.04 LTS trusty
Fixed 0.9.9+dfsg-1ubuntu1.4
italc 20.04 LTS focal Not in release
18.04 LTS bionic
Fixed 1:3.0.3+dfsg1-3ubuntu0.1
16.04 LTS xenial
Fixed 1:2.0.2+dfsg1-4ubuntu0.1
14.04 LTS trusty Not in release
x11vnc 20.04 LTS focal
Not affected
19.04 disco
Not affected
18.10 cosmic Ignored end of life
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libvncserver

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-3877-1
    • LibVNCServer vulnerabilities
    • 31 January 2019
    • USN-4547-1
    • iTALC vulnerabilities
    • 28 September 2020
    • USN-4587-1
    • iTALC vulnerabilities
    • 20 October 2020

Other references