CVE-2017-12219: Cisco Spa 301 Firmware

High severity, CVSS 7.5. EPSS: 2.7% chance of exploitation in the next 30 days.

A vulnerability in the handling of IP fragments for the Cisco Small Business SPA300, SPA500, and SPA51x Series IP Phones could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to the inability to handle many large IP fragments for reassembly in a short duration. An attacker could exploit this vulnerability by sending a crafted stream of IP fragments to the targeted device. An exploit could allow the attacker to cause a DoS condition when the device unexpectedly reloads. Cisco Bug IDs: CSCve82586.

Affected products

• Cisco Spa 301 Firmware: version 7.6.2 only
• Cisco Spa 303 Firmware: version 7.6.2 only
• Cisco Spa 500ds Firmware: version 7.6.2 only
• Cisco Spa 500s Firmware: version 7.6.2 only
• Cisco Spa 501g Firmware: version 7.6.2 only
• Cisco Spa 502g Firmware: version 7.6.2 only
• Cisco Spa 504g Firmware: version 7.6.2 only
• Cisco Spa 508g Firmware: version 7.6.2 only
• Cisco Spa 509g Firmware: version 7.6.2 only
• Cisco Spa 512g Firmware: version 7.6.2 only
• Cisco Spa 514g Firmware: version 7.6.2 only

Published 2017-09-21. Last modified 2026-06-17.