---
title: "CVE-2017-18635\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-2017-18635?format=md
keywords: index, follow
---

# CVE-2017-18635

Publication date 25 September 2019

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**6.1 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2017-18635?format=md#impact-score)

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## Description

An XSS vulnerability was discovered in noVNC before 0.6.2 in which the
remote VNC server could inject arbitrary HTML into the noVNC web page via
the messages propagated to the status field, such as the VNC server name.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| novnc | 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 |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.04 LTS bionic | Vulnerable |
| 16.04 LTS xenial | Fixed 1:0.4+dfsg+1+20131010+gitf68af8af3d-4+deb8u1build0.16.04.1 |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

6.1 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | Required |
  | Scope | Changed |
  | Confidentiality impact | Low |
  | Integrity impact | Low |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.1 · Medium |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18635)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-18635)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-18635)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-18635)

### Related Ubuntu Security Notices (USN)

+ [USN-4522-1](https://usn.ubuntu.com/USN-4522-1)
+ noVNC vulnerability
+ 21 September 2020

### Other references

* <https://bugs.launchpad.net/horizon/+bug/1656435>
* <https://github.com/novnc/noVNC/commit/6048299a138e078aed210f163111698c8c526a13#diff-286f7dc7b881e942e97cd50c10898f03L534>
* <https://github.com/novnc/noVNC/issues/748>
* <https://github.com/novnc/noVNC/releases/tag/v0.6.2>
* <https://www.cve.org/CVERecord?id=CVE-2017-18635>