Webex Meetings OnlineApplication · Cisco
CVE-2018-15421
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 the Cisco Webex Network Recording Player for Microsoft Windows and the Cisco Webex Player for Microsoft Windows could allow an attacker to execute arbitrary code on an affected system. The vulnerability exist because the affected software improperly validates Advanced Recording Format (ARF) and Webex Recording Format (WRF) files. An attacker could exploit this vulnerability by sending a user a malicious ARF or WRF file via a link or an email attachment and persuading the user to open the file by using the affected software. A successful exploit could allow the attacker to execute arbitrary code on the affected system.
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 confidenceThe vulnerability exists in Cisco Webex Network Recording Player and Cisco Webex Player for Microsoft Windows due to improper validation of Advanced Recording Format (ARF) and Webex Recording Format (WRF) files. An attacker can send a malicious ARF or WRF file via link or email attachment, and if a user opens it with the affected software, arbitrary code execution occurs.
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 Meetings OnlineApplication
< 1.3.37
Webex Meetings ServerApplication
= 2.5= 2.5.1.29= 2.6= 2.7= 2.7.1= 2.8
Webex Business Suite 32Application
< 32.15.10
Webex Business Suite 33Application
< 33.3CVSS 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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Identify Webex Player installationCheck for the presence of Cisco Webex Network Recording Player or Cisco Webex Player on the Windows system. Common installation paths include C:\Program Files\Cisco Systems\Webex\ or C:\Program Files (x86)\Cisco Systems\Webex\. Look for executables such as WebexPlayer.exe, atgnetobj.dll, or gr用在.dll.Affected if The player software is installed on the system.
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Retrieve installed player versionRight-click the player executable (e.g., WebexPlayer.exe) and select Properties, then go to the Details tab to view the File Version. Alternatively, open the player and check Help > About. For the Webex Meetings Server or Meetings Online component, access the admin console or meeting participant information.Affected if The version returned matches any of the following: Cisco Webex Meetings Online < 1.3.37; Cisco Webex Meetings Server versions 2.5, 2.5.1.29, 2.6, 2.7, 2.7.1, or 2.8; Cisco Webex Business Suite 32 < 32.15.10; Cisco Webex Business Suite 33 < 33.3.
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Verify file association for ARF/WRF filesCheck if .arf and .wrf file extensions are associated with the Webex Player. Go to Control Panel > Default Programs > Associate a file type or protocol with a program, and look for ARF and WRF extensions. Alternatively, attempt to open a known ARF or WRF file and observe if it launches the Webex Player.Affected if ARF or WRF files are configured to open automatically with the Cisco Webex Player.
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Confirm player receives untrusted filesReview recent download folders, email attachments, or shared links where ARF/WRF recording files may have been received. Check browser download history and email clients for .arf or .wrf file attachments from untrusted sources.Affected if The user has received or can open ARF/WRF files from external or untrusted sources using the affected player.
If Cisco Webex Network Recording Player or Cisco Webex Player is installed and its version falls within the affected ranges listed, the environment is vulnerable when processing malicious ARF or 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 data1.3.3732.15.1033.3
Apply the Cisco patch for this vulnerability when available. Until then, exercise caution with unsolicited ARF/WRF files, disable automatic file opening in the player, and consider endpoint protection solutions.
Fix this in Webex Meetings Online
Scoped from the published advisory
- Consultation4.0 h
- Implementation6.0 h
- Testing3.0 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 $4,304.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-15421 — 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-2018-15421 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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