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Vulnerability of Cisco IOS XR: denial of service via BGP Update Attribute

Synthesis of the vulnerability 

An attacker can trigger a fatal error via BGP Update Attribute of Cisco IOS XR, in order to trigger a denial of service.
Vulnerable systems: Cisco ASR, IOS XR Cisco, Cisco Router.
Severity of this threat: 2/4.
Creation date: 22/01/2020.
Références of this weakness: CERTFR-2020-AVI-055, cisco-sa-20200122-ios-xr-bgp-dos, CSCvr69950, CVE-2019-15989, VIGILANCE-VUL-31400.

Description of the vulnerability 

An attacker can trigger a fatal error via BGP Update Attribute of Cisco IOS XR, in order to trigger a denial of service.
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This weakness alert impacts software or systems such as Cisco ASR, IOS XR Cisco, Cisco Router.

Our Vigil@nce team determined that the severity of this computer vulnerability note 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 security bulletin.

Solutions for this threat 

Cisco IOS XR: solution CSCvr69950.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr69950
  https://tools.cisco.com/bugsearch/bug/CSCvr69950
  https://tools.cisco.com/quickview/bug/CSCvr69950
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