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UC Software - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Vulnerability Summary

Poly VVX phones (all models) are vulnerable to path traversal manipulations that could be used by a malicious party to gain unauthorized access to the system.


Last Update: 3/11/2022
Initial Public Release: 12/9/2015
Advisory ID:  PLYVC15-10

Product Affected

VVX 101/VVX 201

VVX 300/VVX 310

VVX 400/VVX 410

VVX 500/VVX 600

VVX 1500

UC Software 4.1.8 and prior

UC Software 5.2.3 and prior

UC Software 5.3.1 and prior

UC Software 5.4.0 and prior

UC Software 5.2.4 

UC Software 5.3.2

UC Software 5.4.0A



Poly recommends customers upgrade to the respective firmware build as required.



For customers who cannot immediately upgrade to a non-vulnerable UCS version, administrators may mitigate this vulnerability by disabling the web server on VVX phones. In addition, we recommend administrators follow standard best practices and change all default passwords and firewall web access to VVX phones.

To disable a phone’s web server via provisioning, set the httpd.enabled parameter to 0 in your profiles. Consult the VVX Administrator Guide for additional details. This setting can also be reconfigured directly on the phone by an administrator, under:

Settings -> Advanced -> Administration Settings -> Web Server Configuration.

On Poly phones with UC Software 5.1.1 or later that are registered with a Skype for Business Server, access to the Web Configuration Utility is by default disabled as a security precaution.


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 Jake Reynolds from Depth Security for reporting security vulnerabilities to us and for their coordinated disclosure.

Revision History
1.0 12/9/2015 Original publication
2.0 3/11/2022 Format Changes

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