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Vulnerability of Cisco IOS XR: denial of service via IS-IS SNMP

Synthesis of the vulnerability 

An attacker can trigger a fatal error via IS-IS SNMP of Cisco IOS XR, in order to trigger a denial of service.
Impacted products: Cisco ASR, IOS XR Cisco, Cisco Router.
Severity of this bulletin: 2/4.
Creation date: 22/01/2020.
Références of this threat: CERTFR-2020-AVI-055, cisco-sa-20200122-ios-xr-dos, CSCvr62342, CVE-2019-16027, VIGILANCE-VUL-31401.

Description of the vulnerability 

An attacker can trigger a fatal error via IS-IS SNMP of Cisco IOS XR, in order to trigger a denial of service.
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This threat impacts software or systems such as Cisco ASR, IOS XR Cisco, Cisco Router.

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

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

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

Solutions for this threat 

Cisco IOS XR: solution CSCvr62342.
The solution is described on the Cisco site:
  https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvr62342
  https://tools.cisco.com/bugsearch/bug/CSCvr62342
  https://tools.cisco.com/quickview/bug/CSCvr62342
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