Webex Meetings ServerApplication · Cisco
CVE-2020-3419
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 Meetings and Cisco Webex Meetings Server could allow an unauthenticated, remote attacker to join a Webex session without appearing on the participant list. This vulnerability is due to improper handling of authentication tokens by a vulnerable Webex site. An attacker could exploit this vulnerability by sending crafted requests to a vulnerable Cisco Webex Meetings or Cisco Webex Meetings Server site. A successful exploit requires the attacker to have access to join a Webex meeting, including applicable meeting join links and passwords. The attacker could then exploit this vulnerability to join meetings, without appearing in the participant list, while having full access to audio, video, chat, and screen sharing capabilities.
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 confidenceThis is an authentication bypass vulnerability in Cisco Webex Meetings and Cisco Webex Meetings Server where improper handling of authentication tokens allows an attacker who already has meeting join links and passwords to join sessions without appearing in the participant list, while retaining full access to audio, video, chat, and screen sharing capabilities.
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 ServerApplication
< 3.0= 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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 Cisco Webex Meetings Server deploymentReview your environment inventory or documentation to determine if Cisco Webex Meetings Server is deployed. Check for installed packages, running services, or administrative consoles associated with Webex Meetings Server.Affected if Cisco Webex Meetings Server is in use and the version falls within < 3.0, = 3.0, or = 4.0
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Determine the installed version of Cisco Webex Meetings ServerAccess the Webex Meetings Server administrative interface or use the system's package management tools to query the installed version. Compare the version number against the affected ranges: versions prior to 3.0, version 3.0, and version 4.0.Affected if The installed version is less than 3.0, equals 3.0, or equals 4.0
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Verify participant list visibility in active meetingsJoin an existing scheduled meeting using valid credentials and a meeting join link. After joining, check whether your name appears in the participant list or participant panel of that meeting. Also have another attendee verify if you are visible to them.Affected if After joining a meeting, your name does not appear in the participant list but you retain full access to audio, video, chat, and screen sharing capabilities
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Audit meeting participant lists for anomaliesReview meeting logs or ask meeting hosts to audit their participant lists during and after meetings. Look for meetings where attendee counts or participant names do not match expected attendance, or where unknown participants may have joined undetected.Affected if Participant list inconsistencies are found where the actual attendee count does not match the visible participant list
A user is affected if they are running Cisco Webex Meetings Server version 3.0 or 4.0 (or any version prior to 3.0) AND they observe that meeting participants can join meetings without appearing in the participant list.
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 data3.0
Apply the vendor-provided Cisco patch for CVE-2020-3419 and verify that meeting participants correctly appear in the participant list after the update.
Fix this in Webex Meetings Server
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 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 $2,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3419 — 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-2020-3419 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