CVE-2017-6779: Cisco Emergency Responder

High severity, CVSS 7.5. EPSS: 2% chance of exploitation in the next 30 days.

Multiple Cisco products are affected by a vulnerability in local file management for certain system log files of Cisco collaboration products that could allow an unauthenticated, remote attacker to cause high disk utilization, resulting in a denial of service (DoS) condition. The vulnerability occurs because a certain system log file does not have a maximum size restriction. Therefore, the file is allowed to consume the majority of available disk space on the appliance. An attacker could exploit this vulnerability by sending crafted remote connection requests to the appliance. Successful exploitation could allow the attacker to increase the size of a system log file so that it consumes most of the disk space. The lack of available disk space could lead to a DoS condition in which the application functions could operate abnormally, making the appliance unstable. This vulnerability affects the following Cisco Voice Operating System (VOS)-based products: Emergency Responder, Finesse, Hosted Collaboration Mediation Fulfillment, MediaSense, Prime License Manager, SocialMiner, Unified Communications Manager (UCM), Unified Communications Manager IM and Presence Service (IM&P - earlier releases were known as Cisco Unified Presence), Unified Communication Manager Session Management Edition (SME), Unified Contact Center Express (UCCx), Unified Intelligence Center (UIC), Unity Connection, Virtualized Voice Browser. This vulnerability also affects Prime Collaboration Assurance and Prime Collaboration Provisioning. Cisco Bug IDs: CSCvd10872, CSCvf64322, CSCvf64332, CSCvi29538, CSCvi29543, CSCvi29544, CSCvi29546, CSCvi29556, CSCvi29571, CSCvi31738, CSCvi31741, CSCvi31762, CSCvi31807, CSCvi31818, CSCvi31823.

Affected products

  • Cisco Emergency Responder: from 10.5, before 10.5\(1a\) (fixed in 10.5\(1a\)); from 11.0, before 11.5\(4\) (fixed in 11.5\(4\)); from 12.0, before 12.0su1 (fixed in 12.0su1); version 11.0(1.10000.10) only
  • Cisco Finesse: from 11.5, before 11.5\(3\) (fixed in 11.5\(3\)); version 9.5(1) only
  • Cisco Hosted Collaboration Mediation Fulfillment: from 11.5, before 11.5\(3\) (fixed in 11.5\(3\)); version 9.5(1) only
  • Cisco Mediasense: from 11.5, before 11.5su2 (fixed in 11.5su2); version 9.5(1) only
  • Cisco Prime Collaboration Assurance: from 11.6, before 11.6_es16 (fixed in 11.6_es16); from 12.1, before 12.1_es2 (fixed in 12.1_es2)
  • Cisco Prime Collaboration Provisioning: version 12.5 only
  • Cisco Prime License Manager: from 10.5, before 10.5.2 (fixed in 10.5.2); from 11.0, before 11.5\(1\)su5 (fixed in 11.5\(1\)su5)
  • Cisco Socialminer: from 11.6, before 11.6.1 (fixed in 11.6.1)
  • Cisco Unified Communications Manager: from 10.0, before 10.5\(2\)su5 (fixed in 10.5\(2\)su5); from 11.0, before 11.0\(1a\)su4 (fixed in 11.0\(1a\)su4); from 11.5, before 11.5\(1\)su3 (fixed in 11.5\(1\)su3); version 10.5(2.10000.5) only; version 11.0(1.10000.10) only; version 11.5(1.10000.6) only; …
  • Cisco Unified Contact Center Express: from 11.6, before 11.6\(1\) (fixed in 11.6\(1\)); version 9.0(2)su1.3 only
  • Cisco Unified Intelligence Center: from 11.6, before 11.6\(1\) (fixed in 11.6\(1\)); version 9.5(1) only
  • Cisco Unity Connection: from 10.5, before 10.5su5 (fixed in 10.5su5); from 11.0, before 11.5.1su3 (fixed in 11.5.1su3); version 9.5(0.9)tt0 only; version 12.0 only
  • Cisco Virtualized Voice Browser: from 11.6, before 11.6\(1\) (fixed in 11.6\(1\))

Published 2018-06-07. Last modified 2026-06-17.