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CVE Record

CVE-2017-18635: An XSS vulnerability was discovered in noVNC before 0.6.2 in which the remote VNC server could inject arbit...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2017-18635 is a cross-site scripting issue in noVNC before 0.6.2. A remote VNC server could place HTML into noVNC’s status area, potentially affecting the browser session of a user viewing the console.

Executive priority

Treat this as a targeted administrative-console risk, not a broad internet worm risk. Prioritize remediation where noVNC is used by privileged operators or exposed through cloud management portals.

Technical view

The flaw is improper handling of messages propagated to the noVNC status field, including the VNC server name. Sources describe arbitrary HTML injection before noVNC 0.6.2. Distribution advisories later shipped patched novnc packages.

Likely exposure

Exposure is most likely in systems embedding or packaging old noVNC, especially browser-based VNC console workflows. OpenStack Horizon is referenced, but asset owners should verify actual bundled noVNC versions and vendor package status.

Exploitation context

The bundle includes public exploit research and proof-of-concept references, but KEV is false and no cited source states active exploitation. Abuse appears to require a malicious or compromised VNC server influencing text shown in the noVNC page.

Researcher notes

The source bundle lacks CVSS, CWE, and precise affected CPEs. Analysis is based on the CVE description, noVNC 0.6.2 release, upstream commit, Launchpad discussion, distribution advisories, and public research references.

Mitigation direction

  • Upgrade noVNC to 0.6.2 or a vendor-patched package.
  • Apply applicable Debian, Ubuntu, or Red Hat security updates.
  • Inventory products that bundle noVNC rather than only installed packages.
  • Restrict browser-based console access to trusted administrative users.
  • Check vendor guidance for downstream OpenStack Horizon packages.

Validation and detection

  • Confirm noVNC package or bundled version is 0.6.2 or later.
  • Review Horizon or console proxy components for embedded noVNC copies.
  • Verify distribution package changelogs reference this security fix.
  • Ensure server-provided status text renders as text, not HTML.
  • Check internet exposure of noVNC or related console endpoints.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2017-18635 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
11Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.