CVE-2017-18635

Name: CVE-2017-18635
Creator: NVD / NIST
Published: 2019-09-25T23:15:09.937+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 4.81%

Last modified Jun 17, 2026

CVE-2017-18635 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 4.81% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

4.81%

90.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Novnc	Novnc	< 0.6.2
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	16.04
Redhat	Openstack	13

References

https://access.redhat.com/errata/RHSA-2020:0754Third Party Advisory
https://bugs.launchpad.net/horizon/+bug/1656435Issue Tracking, Third Party Advisory
https://github.com/ShielderSec/cve-2017-18635Third Party Advisory
https://github.com/novnc/noVNC/commit/6048299a138e078aed210f163111698c8c526a13#diff-286f7dc7b881e942e97cd50c10898f03L534Patch, Third Party Advisory
https://github.com/novnc/noVNC/issues/748Patch, Third Party Advisory
https://github.com/novnc/noVNC/releases/tag/v0.6.2Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00004.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00024.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4522-1/Third Party Advisory
https://www.shielder.it/blog/exploiting-an-old-novnc-xss-cve-2017-18635-in-openstack/Exploit, Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0754Third Party Advisory
https://bugs.launchpad.net/horizon/+bug/1656435Issue Tracking, Third Party Advisory
https://github.com/ShielderSec/cve-2017-18635Third Party Advisory
https://github.com/novnc/noVNC/commit/6048299a138e078aed210f163111698c8c526a13#diff-286f7dc7b881e942e97cd50c10898f03L534Patch, Third Party Advisory
https://github.com/novnc/noVNC/issues/748Patch, Third Party Advisory
https://github.com/novnc/noVNC/releases/tag/v0.6.2Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00004.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00024.htmlMailing List, Third Party Advisory
https://usn.ubuntu.com/4522-1/Third Party Advisory
https://www.shielder.it/blog/exploiting-an-old-novnc-xss-cve-2017-18635-in-openstack/Exploit, Third Party Advisory

Timeline

Published: Sep 25, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-18635?

How severe is CVE-2017-18635?

CVE-2017-18635 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 4.81% probability of exploitation in the next 30 days.

How do I fix CVE-2017-18635?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-18635?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST