--- title: "CVE-2018-20022\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2018-20022?format=md keywords: index, follow --- # CVE-2018-20022 Publication date 19 December 2018 Last updated 11 July 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **7.5 · High** [Score breakdown](https://ubuntu.com/security/CVE-2018-20022?format=md#impact-score) Toggle side navigation ## Description LibVNC before 2f5b2ad1c6c99b1ac6482c95844a84d66bb52838 contains multiple weaknesses CWE-665: Improper Initialization vulnerability in VNC client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | tightvnc | 26.04 LTS resolute | Needs evaluation | | 25.10 questing | Ignored end of life, was needs-triage | | 25.04 plucky | Ignored end of life, was needs-triage | | 24.10 oracular | Ignored end of life, was needs-triage | | 24.04 LTS noble | Needs evaluation | | 23.10 mantic | Ignored end of life, was needs-triage | | 23.04 lunar | Ignored end of life, was needs-triage | | 22.10 kinetic | Ignored end of life, was needs-triage | | 22.04 LTS jammy | Needs evaluation | | 21.10 impish | Ignored end of life | | 21.04 hirsute | Ignored end of life | | 20.10 groovy | Ignored end of life | | 20.04 LTS focal | Needs evaluation | | 18.04 LTS bionic | Needs evaluation | | 16.04 LTS xenial | Needs evaluation | | 14.04 LTS trusty | Fixed 1.3.9-6.5+deb8u1build0.14.04.1~esm1 Ubuntu Pro | | italc | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 25.04 plucky | Not in release | | 24.10 oracular | Not in release | | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Not in release | | 22.10 kinetic | Not in release | | 22.04 LTS jammy | Not in release | | 21.10 impish | Not in release | | 21.04 hirsute | Not in release | | 20.10 groovy | Not in release | | 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 | | libvncserver | 26.04 LTS resolute | Not affected | | 25.10 questing | Not affected | | 25.04 plucky | Not affected | | 24.10 oracular | Not affected | | 24.04 LTS noble | Not affected | | 23.10 mantic | Not affected | | 23.04 lunar | Not affected | | 22.10 kinetic | Not affected | | 22.04 LTS jammy | Not affected | | 21.10 impish | Not affected | | 21.04 hirsute | Not affected | | 20.10 groovy | Not affected | | 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 | | ssvnc | 26.04 LTS resolute | Not affected | | 25.10 questing | Not affected | | 25.04 plucky | Not affected | | 24.10 oracular | Not affected | | 24.04 LTS noble | Not affected | | 23.10 mantic | Not affected | | 23.04 lunar | Not affected | | 22.10 kinetic | Not affected | | 22.04 LTS jammy | Not affected | | 21.10 impish | Not affected | | 21.04 hirsute | Not affected | | 20.10 groovy | Not affected | | 20.04 LTS focal | Not affected | | 18.04 LTS bionic | Vulnerable | | 16.04 LTS xenial | Fixed 1.0.29-2+deb8u1build0.16.04.1 | | 14.04 LTS trusty | Not in release | | x11vnc | 26.04 LTS resolute | Not affected | | 25.10 questing | Not affected | | 25.04 plucky | Not affected | | 24.10 oracular | Not affected | | 24.04 LTS noble | Not affected | | 23.10 mantic | Not affected | | 23.04 lunar | Not affected | | 22.10 kinetic | Not affected | | 22.04 LTS jammy | Not affected | | 21.10 impish | Not affected | | 21.04 hirsute | Not affected | | 20.10 groovy | Not affected | | 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 | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2018-20022?format=md#patch-details) ### Get expanded security coverage with Ubuntu Pro Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use. [Get Ubuntu Pro](https://ubuntu.com/pro) [30-day free trial](https://ubuntu.com/pro/free-trial) ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | libvncserver | * Upstream: [2f5b2ad](https://github.com/LibVNC/libvncserver/commit/2f5b2ad1c6c99b1ac6482c95844a84d66bb52838) | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 7.5 · High * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | High | | Integrity impact | None | | Availability impact | None | * Scores | Parameter | Value | | --- | --- | | Base score | 7.5 · High | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20022) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2018-20022) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2018-20022) * [Debian](https://security-tracker.debian.org/tracker/CVE-2018-20022) ### Related Ubuntu Security Notices (USN) + [USN-3877-1](https://usn.ubuntu.com/USN-3877-1) + LibVNCServer vulnerabilities + 31 January 2019 + [USN-4547-1](https://usn.ubuntu.com/USN-4547-1) + iTALC vulnerabilities + 28 September 2020 + [USN-4547-2](https://usn.ubuntu.com/USN-4547-2) + SSVNC vulnerabilities + 28 September 2020 + [USN-4587-1](https://usn.ubuntu.com/USN-4587-1) + iTALC vulnerabilities + 20 October 2020 ### Other references * *