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Poly Systems - Logjam Impact

Vulnerability Summary

A vulnerability has been recently disclosed in the way Diffie-Hellman key exchanges take place. This vulnerability could potentially allow a “man-in-the-middle” attacker to downgrade the strength of a TLS connection to a weaker 512-bit, export-grade cryptography.



CVE-2015-4000, aka “Logjam” 

Logjam Attack against the TLS Protocol. The Logjam attack allows a “man-in-the-middle” attacker to downgrade TLS connections to 512-bit, export-grade cryptography. The attack leverages the Diffie-Hellman key exchange and exploits a flaw in the TLS protocol, forcing a downgrade in cryptography. As with other vulnerabilities of its kind (POODLE & FREAK), the exploit requires that the attacker be on the same network as the target. 


Last Update: 10/23/2015
Initial Public Release: 5/21/2015
Advisory ID:  PLYGN15-02

CVE ID: CVE-2015-4000
CVSS Score: 3.7

Product Affected



Media Manager – All Versions 

Not Vulnerable 

CX5000 – All Versions 

Not Vulnerable 

Video Border Proxy (VBP) – All Versions 

Patches available - 11.2.23 and 

CX Product Line, All Other Video Versions 

Not Vulnerable 

RealPresence Desktop – All Versions 

Fix coming in 3.5 - December 

Group Series – All Versions 

Not Vulnerable 

Real Presence Capture Server 

Fix coming in 2.5 

RealPresence Access Director (RPAD) – All Versions 

Web Fixed in 4.2.1, SSH can be disabled with future fix coming 

CloudAXIS MEA – All Versions 

Fix coming in 2.1 – December 

CloudAXIS WSP – All Versions 

Fix coming in 2.1 - December 

Platform Director – All Versions 

Fixed in 2.0 

HDX – All Versions 

Not Vulnerable 

RealPresence Resource Manager (RPRM) 

Fix coming in 9.0* - December 

RSS 4000 – All Versions 


Distributed Media Application (DMA) – All Versions 

Web UI not vulnerable, SSH can be disabled with future fix coming in 9.0* 

Content Sharing Suite Client/Server – All Versions 

Fix coming in 1.5.1 - December 

RealPresence Collaboration Server (RMX) – All Versions 

Fix available in 8.6.2 and 8.5.4 

RealPresence Mobile – All Versions 

Fix coming in 3.5 - December 

UC Phones – VVX - All Versions 

Not Vulnerable 

UC Phones – SPIP & SSIP – All Versions 

Not Vulnerable 


There are no specific mitigations at this time for this vulnerability. Security best practices should be followed, and some recommendations can be found in Poly Recommended Security Best Practices for Unified Communications.



There is no workaround.


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.


Revision History



Original publication



More clarity on local network requirements to exploit



Updated severity to align with CVSS score



Updated product information



Updated release versions



Updated release versions



Updated release versions and dates



Added note regarding version number shift



Format Changes

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