Webex MeetingsApplication · Cisco
CVE-2020-3603
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 confidenceVulnerabilities in Cisco Webex Network Recording Player for Windows and Cisco Webex Player for Windows stem from insufficient validation of elements within ARF or WRF recording files. An attacker can embed malicious code in a crafted recording file and achieve arbitrary code execution by persuading a user to open the file.
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, < 40.8.0
Webex Meetings ServerApplication
= 3.0= 4.0CVSS 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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Check if Webex Player is installedOpen Windows Control Panel > Programs and Features, or run 'Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion' in PowerShell to list installed programsAffected if Cisco Webex Network Recording Player or Cisco Webex Player does not appear in the installed programs list
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Locate the Webex Player executableSearch for 'WebexPlayer.exe' or 'WebexNetworkRecordingPlayer.exe' in typical installation directories such as C:\Program Files\Cisco Systems\ or use the command 'Get-ChildItem -Path C:\ -Recurse -Filter *Webex*Player*.exe -ErrorAction SilentlyContinue'Affected if The executable exists on the system
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Determine the installed versionRight-click the executable, select Properties, then view the Details tab for the version information, or right-click and select 'Properties' > 'Digital Signatures' to see version detailsAffected if The version number cannot be determined or is not visible
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Compare version against affected rangesNote the full version number (for example, 40.6.0) and compare against: Cisco Webex Meetings versions < 40.6.11 OR >= 40.7.0 and < 40.8.0; Cisco Webex Meetings Server versions 3.0 or 4.0Affected if The installed version falls within < 40.6.11, >= 40.7.0 but < 40.8.0, or exactly 3.0 or 4.0 for Webex Meetings Server
The system is affected if Cisco Webex Network Recording Player or Cisco Webex Player for Windows is installed and the version falls within the affected ranges, since the player automatically processes ARF/WRF recording files which are the attack vector for this vulnerability.
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 vendor patches from Cisco for the affected Webex Player software; until patched, instruct users not to open untrusted ARF/WRF files from unknown sources.
Fix this in Webex Meetings
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,744.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3603 — 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-2020-3603 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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- 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
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