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Vulnerability of Cisco IOS XR: denial of service via MPLS OAM

Synthesis of the vulnerability 

An attacker can trigger a fatal error via MPLS OAM of Cisco IOS XR, in order to trigger a denial of service.
Impacted products: Cisco ASR, IOS XR Cisco.
Severity of this bulletin: 2/4.
Creation date: 16/05/2019.
Références of this threat: CERTFR-2019-AVI-228, cisco-sa-20190515-iosxr-mpls-dos, CVE-2019-1846, VIGILANCE-VUL-29343.

Description of the vulnerability 

An attacker can trigger a fatal error via MPLS OAM of Cisco IOS XR, in order to trigger a denial of service.
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This cybersecurity announce impacts software or systems such as Cisco ASR, IOS XR Cisco.

Our Vigil@nce team determined that the severity of this threat alert is medium.

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

An attacker with a expert ability can exploit this computer weakness alert.

Solutions for this threat 

Cisco IOS XR: solution CSCvk63685.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk63685
  https://tools.cisco.com/bugsearch/bug/CSCvk63685
  https://tools.cisco.com/quickview/bug/CSCvk63685
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