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HDX - Improper Restriction of XML External Entity Reference

Vulnerability Summary

Poly HDX video endpoints (all models) are vulnerable to XML External Entity (XXE) manipulations, which could be used by a malicious party to deny service to the web interface of the HDX system.

This XXE vulnerability exploits a capability in XML DTDs (Document Type Definitions) that allows the creation of custom macros or entities. By recursively defining custom entities at the top of a document, an attacker can overwhelm the XML parser, preventing legitimate web traffic from being processed.


Last Update: 3/11/2022
Initial Public Release: 6/29/2016
Advisory ID:  PLYTV16-04

Product Affected
HCX 4000

Prior to 3.1.9

3.1.10 and above
HDX 6000

Prior to 3.1.9

3.1.10 and above
HDX 7000

Prior to 3.1.9

3.1.10 and above
HDX 8000
Prior to 3.1.9 3.1.10 and above
HDX 9000
Prior to 3.1.9 3.1.10 and above

Poly recommends customers upgrade to firmware build 3.1.10 or later.



For customers who cannot immediately upgrade to a non-vulnerable HDX system software version, the most effect means to mitigate this vulnerability is to limit access to the web interface of the HDX to only trusted users. The vulnerable component is only accessible to HDX administrators via the web.

The HDX console does not suffer from lack of responsiveness similar to the web interface, so system recovery is possible through the console interface. In addition, we recommend administrators follow standard best practices and change all default passwords and restrict network web access to the HDX unit using firewalls and whitelists.


Any customer using an affected system who is concerned about this vulnerability within their deployment should contact Poly Technical Support(888) 248-4143, (916) 928-7561, or visit the Poly Support Site.



Poly would like to thank Vincent Hutsebaut of NCIRC for reporting security vulnerabilities to us and for their coordinated disclosure.

Revision History
1.0 6/29/2016
Original Publication
2.0 3/11/2022 Format Changes

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