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Meeting AppApplication · Cisco

CVE-2016-6447

CRITICAL · 9.8 CVSS v3.0 Published 2016-11-03
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
A vulnerability in Cisco Meeting Server and Meeting App could allow an unauthenticated, remote attacker to execute arbitrary code on an affected system. This vulnerability affects the following products: Cisco Meeting Server releases prior to 2.0.1, Acano Server releases prior to 1.8.16 and prior to 1.9.3, Cisco Meeting App releases prior to 1.9.8, Acano Meeting Apps releases prior to 1.8.35. More Information: CSCva75942 CSCvb67878. Known Affected Releases: 1.81.92.0.

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 confidence

A critical remote code execution vulnerability in Cisco Meeting Server and Meeting App allows unauthenticated remote attackers to execute arbitrary code on affected systems. The vulnerability affects multiple product versions including Cisco Meeting Server prior to 2.0.1, Acano Server prior to 1.8.16/1.9.3, and Cisco Meeting App prior to 1.9.8. The CVSS 9.8 score indicates a pre-authentication flaw with network-exploitable remote execution capability.

MitigationUpgrade Cisco Meeting Server to version 2.0.1 or later, Acano Server to 1.8.16/1.9.3 or later, and Meeting Apps to their respective patched versions (1.9.8 for Cisco, 1.8.35 for Acano). Prioritize internet-facing deployments given the unauthenticated remote exploitation vector.

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
Meeting AppApplication
Affected:= 1.8.0= 1.9.0
Meeting ServerApplication
Affected:= 1.8_base= 1.9.0= 2.0.0

CVSS 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
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Cisco Meeting Server version
    Run 'cms --version' or check the product version through the admin web interface under 'About' or 'System Information' pages
    Affected if The version displayed is 1.8.x, 1.9.0, or 2.0.0 (specifically 1.8_base, 1.9.0, or 2.0.0)
  2. Identify installed Cisco Meeting App version
    Check the application version through the installed software (Windows: Programs and Features, Mac: Applications folder, or within the app's About/Preferences)
    Affected if The version displayed is exactly 1.8.0 or 1.9.0
  3. Check for Acano Server installation and version
    If the system was migrated from Acano, check the version via 'aco --version' or through the admin interface as Acano Server versions prior to 1.8.16 and 1.9.3 are also affected
    Affected if Acano Server version is below 1.8.16 or below 1.9.3
  4. Determine if the web admin interface is exposed
    Check network configuration to see if port 443 or the admin web interface is accessible from untrusted networks
    Affected if The admin interface is reachable from the internet or untrusted networks (this vulnerability is pre-authentication and network-exploitable)

You are affected if any Cisco Meeting Server version 1.8_base, 1.9.0, or 2.0.0 is installed, or Cisco Meeting App version 1.8.0 or 1.9.0 is in use, with the admin interface network-accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Cisco Meeting Server to version 2.0.1 or later, Acano Server to 1.8.16/1.9.3 or later, and Meeting Apps to their respective patched versions (1.9.8 for Cisco, 1.8.35 for Acano). Prioritize internet-facing deployments given the unauthenticated remote exploitation vector.

Recommended fix High confidence

Cisco Meeting Server 2.0.1+ | Acano Server 1.8.16+ / 1.9.3+ | Cisco Meeting App 1.9.8+ | Acano Meeting App 1.8.35+

  1. Identify the specific Cisco Meeting Server or Meeting App product and current version running
  2. Determine which product line applies: Cisco Meeting Server, Acano Server, Cisco Meeting App, or Acano Meeting App
  3. For Cisco Meeting Server: upgrade to version 2.0.1 or later
  4. For Acano Server: upgrade to version 1.8.16 or later for 1.8.x line, or version 1.9.3 or later for 1.9.x line
  5. For Cisco Meeting App: upgrade to version 1.9.8 or later
  6. For Acano Meeting App: upgrade to version 1.8.35 or later
  7. After upgrade, verify the new version is running and the vulnerability is remediated
Caveat Review Cisco release notes for migration path from older Acano products to Cisco-branded versions; some legacy functionality may differ

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Meeting App Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing6.0 h
  • Review / QA3.0 h
18.0 hours of engineering $3,120
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2016-6447 in production — separate from our analysis above.

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What this is

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.

What belongs here
  • 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