Telepresence Video Communication Server SoftwareApplication · Cisco
CVE-2015-4315
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 Call Policy Configuration page in Cisco TelePresence Video Communication Server (VCS) Expressway X8.5.3 improperly validates external DTDs, which allows remote authenticated users to read arbitrary files or cause a denial of service via a crafted XML document, aka Bug ID CSCuv31853.
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 Call Policy Configuration page in Cisco TelePresence VCS Expressway X8.5.3 does not disable external entity processing when parsing XML documents. An authenticated attacker can exploit this XXE (XML External Entity) vulnerability by submitting crafted XML with external entity references to read arbitrary files from the server filesystem or cause denial of service through entity expansion attacks.
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
= x8.5.3CVSS 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
- 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 product and versionLog into the VCS Expressway admin interface and navigate to the About page or check the system information to confirm the installed version is Cisco TelePresence VCS Expressway x8.5.3Affected if The product is Cisco TelePresence VCS Expressway and the version is exactly x8.5.3
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Verify Call Policy feature is accessibleNavigate to the Call Policy Configuration page in the admin interface (typically under Applications > Call Policy or similar path depending on the UI version) to confirm the feature is present and accessibleAffected if The Call Policy Configuration page exists and is accessible in the admin interface
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Confirm authentication accessCheck the list of administrative accounts and their privilege levels that have access to the Call Policy Configuration page in the user management or access control settingsAffected if There are authenticated administrative users with access to the Call Policy Configuration page
You are affected if you are running Cisco TelePresence VCS Expressway version x8.5.3 with the Call Policy Configuration page accessible to any authenticated user.
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 dataDisable external DTD/entity processing in the XML parser configuration on the affected VCS Expressway, or apply vendor patches when available. Restrict access to the Call Policy Configuration page to only necessary administrative accounts.
Fix this in Telepresence Video Communication Server Software
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-4315 — 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-2015-4315 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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