dbcve.org
Webex Event CenterApplication · Cisco

CVE-2017-6753

HIGH · 8.8 CVSS v3.0 Published 2017-07-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability in Cisco WebEx browser extensions for Google Chrome and Mozilla Firefox could allow an unauthenticated, remote attacker to execute arbitrary code with the privileges of the affected browser on an affected system. This vulnerability affects the browser extensions for Cisco WebEx Meetings Server, Cisco WebEx Centers (Meeting Center, Event Center, Training Center, and Support Center), and Cisco WebEx Meetings when they are running on Microsoft Windows. The vulnerability is due to a design defect in the extension. An attacker who can convince an affected user to visit an attacker-controlled web page or follow an attacker-supplied link with an affected browser could exploit the vulnerability. If successful, the attacker could execute arbitrary code with the privileges of the affected browser. The following versions of the Cisco WebEx browser extensions are affected: Versions prior to 1.0.12 of the Cisco WebEx extension on Google Chrome, Versions prior to 1.0.12 of the Cisco WebEx extension on Mozilla Firefox. Cisco Bug IDs: CSCvf15012 CSCvf15020 CSCvf15030 CSCvf15033 CSCvf15036 CSCvf15037.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A design defect in Cisco WebEx browser extensions for Chrome and Firefox allows arbitrary code execution with browser privileges. Attackers exploit this by tricking users into visiting malicious webpages or clicking attacker-controlled links, enabling remote code execution on affected Windows systems running WebEx extensions prior to version 1.0.12.

MitigationUpgrade Cisco WebEx browser extensions to version 1.0.12 or later for both Google Chrome and Mozilla Firefox on all affected Windows systems.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Webex Event CenterApplication
Affected:= t30_base= t31_base= t32_base
Webex Meeting CenterApplication
Affected:= t30_base= t31_base= t32_base
Webex MeetingsApplication
Affected:= t30_base
Webex Meetings ServerApplication
Affected:= 1.1_base= 1.5.1.6= 1.5.1.131= 1.5_base= 2.0.1.107= 2.0_base= 2.5.1.5= 2.5.1.29= 2.5.99.2= 2.5_base= 2.6.0= 2.6.1.39
Webex Meetings Server 2.0Application
Affected:= mr2= mr3= mr4= mr5= mr6= mr7= mr8= mr9
Webex Meetings Server 2.0 Mr8 PatchApplication
Affected:= 1
Webex Meetings Server 2.0 Mr9 PatchApplication
Affected:= 1= 2= 3
Webex Meetings Server 2.5Application
Affected:= mr1= mr2= mr3= mr4= mr5= mr6

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify WebEx browser extension in Chrome
    Open Chrome and navigate to chrome://extensions, then enable Developer mode and look for Cisco WebEx or Webex extension entries
    Affected if The extension is present and its version is below 1.0.12
  2. Identify WebEx browser extension in Firefox
    Open Firefox and navigate to about:addons, then click on Extensions to list installed extensions including Cisco WebEx or Webex
    Affected if The extension is present and its version is below 1.0.12
  3. Check the installed extension version in Chrome
    In chrome://extensions, find the WebEx extension and locate the version number displayed in the extension details
    Affected if Version is listed as anything prior to 1.0.12 or the version cannot be determined to be 1.0.12 or later
  4. Check the installed extension version in Firefox
    In about:addons under Extensions, click on the WebEx extension to view its version details
    Affected if Version is listed as anything prior to 1.0.12 or the version cannot be determined to be 1.0.12 or later
  5. Confirm Windows environment
    Verify the operating system is Windows by checking system properties or running 'systeminfo' command
    Affected if The system is running Windows with a WebEx browser extension version below 1.0.12

A user is affected if they have Cisco WebEx browser extension installed in Chrome or Firefox on Windows with a version prior to 1.0.12

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Cisco WebEx browser extensions to version 1.0.12 or later for both Google Chrome and Mozilla Firefox on all affected Windows systems.

Fix this in Webex Event Center Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2017-6753 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2017-6753 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data