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Cisco Bug: CSCuq07828 - 8945 phones become unresponsive on receiving a URL with n, hhnxx, llnxx

Last Modified

Nov 27, 2020

Products (33)

  • Cisco SIP IP Phone Software
  • Cisco Unified IP Phone 9951
  • Cisco Unified IP Phone 7945G
  • Cisco IP Phone 7841
  • Cisco IP Phone 8851
  • Cisco Unified IP Phone 7971G-GE
  • Cisco Unified IP Phone 7962G
  • Cisco Unified IP Phone 7941G
  • Cisco Unified IP Phone 7911G
  • Cisco Unified IP Phone 7961G-GE
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Known Affected Releases


Description (partial)

When sending an 89xx phone a CiscoIPPhoneExecute command a URL that contains small case "n", " hhnxx" or "llnxx", the phone completely locks up and must be power-cycled to recover.

A ping command to the Phone IP address returns response but the device is unresponsive - both physically and through CUCM Admin UI. Phone reset through the UI gets no response. Hard reset on the phone is necessary.

The URL that contains specific characters like small case "n", " hhnxx" or "llnxx". Upper case "N" does not seem to create a problem.
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