Cisco TelePresence Video Communication Server X8.5.2 Registration Impersonation input validation

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Cisco TelePresence Video Communication Server X8.5.2 (Unified Communication Software). It has been declared as critical. Affected by this vulnerability is an unknown part of the component Registration. The manipulation with an unknown input leads to a input validation vulnerability (Impersonation). The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, and integrity. The summary by CVE is:

The 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.

The weakness was presented 08/20/2015 as CSCuv40396 as confirmed advisory (Website). The advisory is shared at This vulnerability is known as CVE-2015-4316 since 06/04/2015. The attack can be launched remotely. A single authentication is necessary for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/12/2022).

The vulnerability scanner Nessus provides a plugin with the ID 85651 (Cisco TelePresence VCS Expressway Series 8.5.2 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (85651), SecurityFocus (BID 76353†) and Vulnerability Center (SBV-52970†).








  • end of life (old version)

CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.4
VulDB Temp Score: 5.4
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Name: Impersonation
Class: Input validation / Impersonation

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 85651
Nessus Name: Cisco TelePresence VCS Expressway Series 8.5.2 Multiple Vulnerabilities
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OpenVAS ID: 803167
OpenVAS Name: Cisco TelePresence Video Communication Server (VCS) Multiple Vulnerabilities
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Threat Intelligenceinfo

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Recommended: no mitigation known
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06/04/2015 🔍
08/13/2015 +70 days 🔍
08/13/2015 +0 days 🔍
08/20/2015 +7 days 🔍
08/20/2015 +0 days 🔍
08/21/2015 +1 days 🔍
09/25/2015 +35 days 🔍
06/12/2022 +2452 days 🔍



Advisory: CSCuv40396
Status: Confirmed

CVE: CVE-2015-4316 (🔍)
SecurityFocus: 76353 - Cisco TelePresence Video Communication Server Expressway Unauthorized Access Vulnerability
SecurityTracker: 1033282
Vulnerability Center: 52970 - Cisco TelePresence Video Communication Server Remote Spoofing Vulnerability due to Improper Validation, Medium


Created: 08/21/2015 10:19 AM
Updated: 06/12/2022 07:40 PM
Changes: 08/21/2015 10:19 AM (56), 03/02/2018 10:13 AM (13), 06/12/2022 07:33 PM (3), 06/12/2022 07:40 PM (1)
Complete: 🔍
Cache ID: 44:7AC:40


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