CVE-2019-16008: Cisco IP Phone 6821 Firmware

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in the web-based GUI of Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based interface of an affected system. The vulnerability is due to insufficient validation of user-supplied input by the web-based GUI of an affected system. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Affected products

  • Cisco IP Phone 6821 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 6825 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 6841 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 6851 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 6861 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 6871 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 7811 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 7821 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 7832 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 7841 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 7861 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8811 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8831 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8832 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8841 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8845 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8851 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8861 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))
  • Cisco IP Phone 8865 Firmware: before 11.3\(1\) (fixed in 11.3\(1\))

Published 2020-01-26. Last modified 2026-06-17.