CVE-2019-1635: Cisco IP Conference Phone 7832 Firmware

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

A vulnerability in the call-handling functionality of Session Initiation Protocol (SIP) Software for Cisco IP Phone 7800 Series and 8800 Series could allow an unauthenticated, remote attacker to cause an affected phone to reload unexpectedly, resulting in a temporary denial of service (DoS) condition. The vulnerability is due to incomplete error handling when XML data within a SIP packet is parsed. An attacker could exploit this vulnerability by sending a SIP packet that contains a malicious XML payload to an affected phone. A successful exploit could allow the attacker to cause the affected phone to reload unexpectedly, resulting in a temporary DoS condition.

Affected products

  • Cisco IP Conference Phone 7832 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Conference Phone 8832 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 7811 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 7821 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 7841 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 7861 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 8811 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 8841 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 8845 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 8851 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 8861 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco IP Phone 8865 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco Unified IP 8831 Conference PHONE1 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco Unified IP 8831 Conference Phone For Third-Party Call CONTROL2 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco Wireless IP Phone 8821-Ex Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only
  • Cisco Wireless IP Phone 8821 Firmware: version 9.3(4)sr3 only; version 10.3(1)sr4b only; version 11.0(4)sr2 only; version 12.1(1)sr1 only

Published 2019-05-03. Last modified 2026-06-17.