Webex MeetingsApplication · Cisco
CVE-2020-3604
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 · uneditedMultiple vulnerabilities in Cisco Webex Network Recording Player for Windows and Cisco Webex Player for Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerabilities are due to insufficient validation of certain elements of a Webex recording that is stored in the Advanced Recording Format (ARF) or Webex Recording Format (WRF). An attacker could exploit these vulnerabilities by sending a user a malicious ARF or WRF file through a link or email attachment and persuading the user to open the file with the affected software on the local system. A successful exploit could allow the attacker to execute arbitrary code on the affected system with the privileges of the targeted user.
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 confidenceMultiple vulnerabilities in Cisco Webex Network Recording Player and Webex Player for Windows allow arbitrary code execution due to insufficient validation of elements within ARF or WRF recording files. An attacker sends a malicious recording file to a user who opens it, resulting in code execution with the user's privileges.
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 MeetingsApplication
< 40.6.11>= 40.7.0, < 40.8.0CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/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 checksWork through these to decide whether this CVE applies to you.
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Verify Webex Player installationCheck for Webex Network Recording Player or Webex Player on the system by searching in Add/Remove Programs (Programs and Features), or look for executable files such as 'webexrecordingplayer.exe' or 'WebexPlayer.exe' in common installation directories like C:\Program Files\Cisco Systems\ or C:\Program Files (x86)\Cisco Systems\Affected if The player software is installed on the Windows system
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Determine installed Webex Player versionRight-click the Webex player executable (webexrecordingplayer.exe or WebexPlayer.exe), select Properties, and view the Version or Details tab to find the product version. Alternatively, check the version listed in Add/Remove Programs for the installed Cisco Webex applicationAffected if The version falls within < 40.6.11, or >= 40.7.0 and < 40.8.0
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Confirm ARF/WRF file handling is enabledCheck if .arf and .wrf file extensions are associated with the Webex Player by opening a command prompt and running 'assoc .arf' and 'assoc .wrf', or by looking in Default Apps > Choose default apps by file type in Windows Settings to see if Webex Player is set as the handler for these extensionsAffected if The player is configured as the default handler for ARF or WRF recording files, meaning users can double-click these files to open them in the vulnerable player
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Identify user exposure to recording filesSearch the system for .arf or .wrf files in common download folders, email attachments locations, or network shares to determine if users likely receive or store Webex recording files that could be opened with the playerAffected if Users have access to or receive ARF/WRF recording files and the vulnerable player version is installed and configured to open them
A user is affected if Cisco Webex Network Recording Player or Webex Player for Windows is installed with a version in the ranges < 40.6.11 or >= 40.7.0 to < 40.8.0, and the player is configured to handle ARF or WRF file types that users may open.
Generated from the published advisory. Verify against your own configuration.
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 data40.6.1140.8.0
Apply Cisco's vendor patches for the affected Webex player software. Until patched, warn users not to open untrusted ARF/WRF files from unknown sources and consider email gateway controls to block suspicious attachments.
Fix this in Webex Meetings
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3604 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-3604 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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