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CVE-2017-18635

24
FAUCET Score

CVE-2017-18635 describes a Cross-Site Scripting (XSS) vulnerability in noVNC versions prior to 0.6.2, allowing a malicious VNC server to inject arbitrary HTML into the noVNC web page via the status field. This medium-severity vulnerability (CVSS 6.1) has a low attack complexity and requires user interaction, potentially leading to limited impact on confidentiality and integrity. While not listed in CISA's KEV catalog and lacking public exploit code in Metasploit or ExploitDB, there is evidence of community discussion and media coverage, including an article detailing its exploitation in OpenStack.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.6.2CPE matchmatch criteria
cpe:2.3:a:novnc:novnc:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
16.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
13CPE matchmatch criteria
cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.81%
Probability of exploitation in next 30 days
EPSS Percentile
91.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0481 is in the 96th percentile among its peer group of 26,209 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: @novnc/novncFixed in: 0.6.2
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization Engine 4.4Fixed in: novnc-0:1.1.0-1.el8ost
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 13.0 (Queens) for RHEL 7.6 EUSFixed in: novnc-0:1.1.0-2.el7ost
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 13.0 (Queens)Fixed in: novnc-0:1.1.0-2.el7ost
View patch
redhatvendor investigatingvia redhat_api
Product: Red Hat OpenStack Platform 14 (Rocky)Fixed in: novnc
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: novnc

Vendor Advisories (2)

npmGHSA-49rv-g7w5-m8xxmedium

Cross-Site Scripting in @novnc/novnc

Aug 28, 2020
redhatCVE-2017-18635Moderate

novnc: XSS vulnerability via the messages propagated to the status field

Jan 12, 2019

References

access.redhat.com / errata/RHSA-2020:0754
Third Party Advisory
bugs.launchpad.net / horizon/+bug/1656435
Issue TrackingThird Party Advisory
github.com / novnc/noVNC/commit/6048299a138e078aed210f163111698c8c526a13
PatchThird Party Advisory
github.com / novnc/noVNC/issues/748
PatchThird Party Advisory
github.com / novnc/noVNC/releases/tag/v0.6.2
Release NotesThird Party Advisory
github.com / ShielderSec/cve-2017-18635
Third Party Advisory
lists.debian.org / debian-lts-announce/2019/10/msg00004.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2021/12/msg00024.html
Mailing ListThird Party Advisory
usn.ubuntu.com / 4522-1
Third Party Advisory
shielder.it / blog/exploiting-an-old-novnc-xss-cve-2017-18635-in-openstack
ExploitThird Party Advisory