high
7.7
CWE
20
Advisory Published
Updated

CVE-2019-16027: Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability

First published: Sun Jan 26 2020(Updated: )

A vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS–IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS–IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS–IS process.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS XRv 9000=4.3.2
Cisco XR 12404
Cisco XR 12406
Cisco XR 12410
Cisco XR 12416
Cisco IOS XRv 9000=5.2.5
Cisco IOS XRv 9000=6.2.2
Cisco IOS XRv 9000=6.2.3
Cisco IOS XRv 9000=6.2.25
Cisco IOS XRv 9000=6.3.3
Cisco IOS XRv 9000=6.4.2
Cisco NCS 6000
Cisco NCS 6008-8-Slot Chassis
Cisco IOS XRv 9000=6.1.3
Cisco IOS XRv 9000=6.1.4
Cisco IOS XRv 9000=6.5.2
Cisco IOS XRv 9000=6.5.3
Cisco NCS 5001 Firmware
Cisco NCS 5002
Cisco NCS 5011
Cisco IOS XRv 9000=6.3.15
Cisco IOS XRv 9000=6.6.1
Cisco IOS XRv 9000=6.6.25
Cisco NCS 5500
Cisco NCS 5501-SE
Cisco NCS 5502
Cisco NCS 5508
Cisco NCS 5516
Cisco CRS
Cisco IOS XRv 9000=6.6.2
Cisco IOS XRv 9000
Cisco NCS 540 Series
Cisco NCS 560-4
Cisco IOS XRv 9000=6.1.2
Cisco IOS XRv 9000=6.3.2
Cisco ASR 9000v
Cisco ASR 9000v-v2=v2
Cisco ASR 9001
Cisco ASR 9006
Cisco ASR 9010
Cisco ASR 9901-RP Firmware
Cisco ASR 9903
Cisco ASR 9904
Cisco ASR 9906
Cisco ASR 9910
Cisco ASR 9912
Cisco ASR 9920
Cisco ASR 9922

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-16027?

    CVE-2019-16027 is a vulnerability in the implementation of the Intermediate System-to-Intermediate System (IS-IS) routing protocol functionality in Cisco IOS XR Software.

  • What is the severity of CVE-2019-16027?

    The severity of CVE-2019-16027 is high with a severity value of 6.5.

  • How does CVE-2019-16027 impact Cisco IOS XR Software?

    CVE-2019-16027 can allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS-IS process.

  • Which versions of Cisco IOS XR Software are affected by CVE-2019-16027?

    Cisco IOS XR Software versions 4.3.2, 5.2.5, 6.2.2, 6.2.3, 6.2.25, 6.3.3, 6.4.2, 6.1.3, 6.1.4, 6.5.2, 6.5.3, 6.3.15, 6.6.1, 6.6.25, 6.6.2 are affected by CVE-2019-16027.

  • How can I fix CVE-2019-16027 in Cisco IOS XR Software?

    To fix CVE-2019-16027 in Cisco IOS XR Software, please refer to the Cisco Security Advisory for remediation steps.

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