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Vulnerability of Cisco IP Phone: denial of service via SIP XML

Synthesis of the vulnerability 

An attacker can trigger a fatal error via SIP XML of Cisco IP Phone, in order to trigger a denial of service.
Impacted software: Cisco IP Phone.
Severity of this computer vulnerability: 2/4.
Creation date: 02/05/2019.
Références of this announce: CERTFR-2019-AVI-193, cisco-sa-20190501-phone-sip-xml-dos, CSCvm39405, CSCvo19825, CSCvo21348, CSCvo23532, CVE-2019-1635, VIGILANCE-VUL-29188.

Description of the vulnerability 

An attacker can trigger a fatal error via SIP XML of Cisco IP Phone, in order to trigger a denial of service.
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This weakness impacts software or systems such as Cisco IP Phone.

Our Vigil@nce team determined that the severity of this vulnerability announce is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this threat bulletin.

Solutions for this threat 

Cisco IP Phone: solution CSCvm39405 CSCvo19825 CSCvo21348 CSCvo23532.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvm39405
  https://tools.cisco.com/bugsearch/bug/CSCvm39405
  https://tools.cisco.com/quickview/bug/CSCvm39405
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo19825
  https://tools.cisco.com/bugsearch/bug/CSCvo19825
  https://tools.cisco.com/quickview/bug/CSCvo19825
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo21348
  https://tools.cisco.com/bugsearch/bug/CSCvo21348
  https://tools.cisco.com/quickview/bug/CSCvo21348
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvo23532
  https://tools.cisco.com/bugsearch/bug/CSCvo23532
  https://tools.cisco.com/quickview/bug/CSCvo23532
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