CVE-2018-6307

Publication date 19 December 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libvncserver	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
x11vnc	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	Upstream: ca2a5ac

Severity score breakdown

Parameter	Value
Base score	8.1 · High
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:H/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