Webex PlayerApplication · Cisco
CVE-2021-1526
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 · uneditedA vulnerability in Cisco Webex Player for Windows and MacOS could allow an attacker to execute arbitrary code on an affected system. This vulnerability is due to insufficient validation of values in Webex recording files that are in Webex Recording Format (WRF). An attacker could exploit this vulnerability by sending a user a malicious 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 confidenceA vulnerability in Cisco Webex Player for Windows and MacOS stems from insufficient validation of values in Webex Recording Format (WRF) files. An attacker can craft a malicious WRF file that, when opened by a user, allows arbitrary code execution with the privileges of that user.
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 PlayerApplication
< 41.5CVSS 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 Cisco Webex Player is installedOn Windows, check for the presence of 'Webex Player' in the list of installed programs via Control Panel > Programs and Features, or look for the executable at C:\Program Files\Cisco Systems\Webex Player\ or C:\Program Files (x86)\Cisco Systems\Webex Player\. On Mac, check /Applications for Webex Player.app.Affected if Cisco Webex Player is installed on the system
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Identify the installed Webex Player versionOn Windows, right-click the Webex Player executable (typically in Program Files\Cisco Systems\Webex Player\) and select Properties, then view the Details tab for the version number. On Mac, right-click Webex Player.app, select Get Info, and view the version information under the General section.Affected if The version number shown is less than 41.5 (for example, 41.0, 41.1, 41.2, 41.3, or 41.4)
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Verify the WRF file handling capabilityOpen Cisco Webex Player and attempt to play a .wrf file, or check if .wrf file association is registered to the Webex Player application.Affected if The player can open WRF files, indicating the vulnerable parsing code is active
A system is affected if Cisco Webex Player is installed with a version number below 41.5 and the application can process WRF files.
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 data41.5
Users should not open WRF files from untrusted sources. Organizations should deploy the Cisco security update for Webex Player and implement controls preventing users from opening untrusted WRF files.
Fix this in Webex Player
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-2021-1526 — 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-2021-1526 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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