Collaboration Meeting RoomsApplication · Cisco
CVE-2021-1500
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 web-based management interface of Cisco Webex Video Mesh could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of the URL parameters in an HTTP request. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to redirect a user to a malicious website. Attackers may use this type of vulnerability, known as an open redirect attack, as part of a phishing attack to persuade users to unknowingly visit malicious sites.
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 open redirect vulnerability in Cisco Webex Video Mesh's web-based management interface. The flaw stems from improper input validation of URL parameters in HTTP requests, allowing unauthenticated attackers to craft malicious links that redirect users to arbitrary external websites. Successful exploitation enables phishing attacks where victims are unknowingly directed to malicious sites.
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
Collaboration Meeting RoomsApplication
= 2.0
Webex Video MeshApplication
< 2021.10.18.2439mCVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 Video Mesh or Cisco Collaboration Meeting Rooms installationLocate and inventory any Cisco Webex Video Mesh appliances or Cisco Collaboration Meeting Rooms (CCMR) software in your environment. Check your asset management records, network scans, or physically inspect known video conferencing infrastructure.Affected if Either product is present in the environment
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Check installed version against affected rangesAccess the web-based management interface or use the command-line interface to retrieve the product version. For CCMR, look for version 2.0. For Webex Video Mesh, compare the version to 2021.10.18.2439m.Affected if Version is exactly 2.0 for CCMR OR less than 2021.10.18.2439m for Webex Video Mesh
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Verify web management interface is accessibleConfirm the web-based management interface of the affected product is reachable from network locations. Check firewall rules, VPN configurations, and access control lists that govern access to the management portal.Affected if The management interface is externally or broadly accessible without strong authentication controls
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Inspect HTTP traffic for redirect parametersReview web server access logs or proxy logs for the management interface, looking for URL parameters that control redirection (such as 'next', 'redirect', 'url', 'dest', or similar). Analyze requests for patterns that include external domains.Affected if Unvalidated redirect parameters are present in HTTP requests to the management interface
Your environment is affected if you run Cisco Webex Video Mesh below version 2021.10.18.2439m or Cisco Collaboration Meeting Rooms version 2.0, and the web management interface is accessible with exploitable redirect parameters.
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.
dbcve · scoped2021.10.18.2439m
Apply the Cisco patch for CVE-2021-1500 when available; until then, educate users about clicking links from untrusted sources and consider implementing URL filtering at the network perimeter to detect and block suspicious redirects.
Webex Video Mesh version 2021.10.18.2439m or later
- 1. Back up the current Webex Video Mesh configuration before starting the upgrade process
- 2. Navigate to the Cisco Software Download page (tools.cisco.com) and locate Webex Video Mesh software
- 3. Download version 2021.10.18.2439m or later for Webex Video Mesh
- 4. Follow Cisco's standard upgrade procedure for Webex Video Mesh appliances: upload the upgrade file via the web-based management interface or CLI
- 5. After upgrade completes, verify the new version is installed by checking the web-based management interface
- 6. Test that open redirect vulnerability is remediated by attempting to validate URL parameter handling
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Collaboration Meeting Rooms
Scoped from the published advisory
- Consultation4.0 h
- Implementation3.0 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 $3,440.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1500 — 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-2021-1500 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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