Telepresence Video Communication Server SoftwareApplication · Cisco
CVE-2015-4316
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 · uneditedThe Mobile and Remote Access (MRA) endpoint-validation feature in Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.2 improperly validates the phone line used for registration, which allows remote authenticated users to conduct impersonation attacks via a crafted registration, aka Bug ID CSCuv40396.
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 Mobile and Remote Access (MRA) endpoint-validation feature in Cisco TelePresence VCS Expressway X8.5.2 fails to properly validate the phone line identifier during endpoint registration. This allows any remote authenticated user to submit crafted registration requests containing arbitrary phone line values, enabling impersonation of other registered endpoints or users.
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
Telepresence Video Communication Server SoftwareApplication
= x8.5.2CVSS 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
- Authentication
- Single
- Confidentiality
- Partial
- Integrity
- None
- Availability
- Partial
AV:N/AC:L/Au:S/C:P/I:N/A:P
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 VCS Expressway versionAccess the VCS admin interface (typically https://<vcs-ip>/) and navigate to System > About or use CLI command 'xstatus version' to retrieve the installed software versionAffected if The installed version is exactly x8.5.2 (note: only this specific version is affected, not a range)
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Verify MRA feature statusIn the VCS admin interface, navigate to Applications > MRA or Configuration > Unified Communications > Mobile and Remote Access to check if MRA is enabledAffected if MRA is enabled and the version is x8.5.2 - the vulnerability only applies when MRA is active
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Confirm endpoint registration is permittedCheck MRA registration settings under the MRA configuration page - verify that endpoint registration via MRA is allowed (look for 'Allow MRA registrations' or similar setting)Affected if MRA endpoint registration is permitted and version is x8.5.2
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Check MRA authentication configurationReview MRA authentication settings under Configuration > Authentication - determine if remote/authenticated users can submit registration requests through MRAAffected if MRA accepts authenticated user registrations and version is x8.5.2
You are affected only if your Cisco VCS Expressway is exactly version x8.5.2 AND the Mobile and Remote Access (MRA) feature is enabled and configured to allow endpoint registrations from remote authenticated users.
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 dataApply the vendor patch for Cisco VCS Expressway X8.5.2 (or upgrade to a fixed version), or disable MRA functionality if not required, and restrict network access to the VCS management interfaces to trusted administrative networks.
Fix this in Telepresence Video Communication Server Software
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-4316 — 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-2015-4316 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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- Version or environment caveats, and links to real fixes
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