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Vulnerability of Cisco IP Phone 7800/8800: denial of service via SIP

Synthesis of the vulnerability 

An attacker can send malicious SIP packets to Cisco IP Phone 7800/8800, in order to trigger a denial of service.
Vulnerable systems: Cisco IP Phone.
Severity of this threat: 2/4.
Creation date: 04/07/2019.
Références of this weakness: CERTFR-2019-AVI-304, cisco-sa-20190703-ip-phone-sip-dos, CSCvc61672, CVE-2019-1922, VIGILANCE-VUL-29690.

Description of the vulnerability 

An attacker can send malicious SIP packets to Cisco IP Phone 7800/8800, in order to trigger a denial of service.
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This computer vulnerability announce impacts software or systems such as Cisco IP Phone.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin 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 alert.

Solutions for this threat 

Cisco IP Phone 7800/8800: solution CSCvc61672.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvc61672
  https://tools.cisco.com/bugsearch/bug/CSCvc61672
  https://tools.cisco.com/quickview/bug/CSCvc61672
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