high
8.6
CWE
754
Advisory Published
Updated

CVE-2019-15989: Cisco IOS XR Software Border Gateway Protocol Attribute Denial of Service Vulnerability

First published: Sun Jan 26 2020(Updated: )

A vulnerability in the implementation of the Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of a BGP update message that contains a specific BGP attribute. An attacker could exploit this vulnerability by sending BGP update messages that include a specific, malformed attribute to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer or would need to be injected by the attacker into the victim’s BGP network on an existing, valid TCP connection to a BGP peer.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS XRv 9000=6.6.1
Cisco ASR 9000v-v2
Cisco ASR 9001
Cisco ASR 9006
Cisco ASR 9010
Cisco ASR 9901-RP Firmware
Cisco ASR 9904
Cisco ASR 9906
Cisco ASR 9910
Cisco ASR 9912
Cisco ASR 9922
Cisco NCS 540 Series
Cisco NCS 5501-SE
Cisco NCS 5501-SE
Cisco NCS 5502
Cisco NCS 5502-SE Firmware
Cisco NCS 5508
Cisco NCS 5516
Cisco NCS 6000
Cisco IOS XRv 9000=6.6.2
Cisco ASR 9000v-v2
Cisco ASR 9001
Cisco ASR 9006
Cisco ASR 9010
Cisco ASR 9901-RP Firmware
Cisco ASR 9904
Cisco ASR 9906
Cisco ASR 9910
Cisco ASR 9912
Cisco ASR 9922
Cisco CRS
Cisco IOS XRv 9000
Cisco IOS XRv 9000=6.6.25
Cisco NCS 540
Cisco NCS 560-4
Cisco IOS XRv 9000=7.0.1
Cisco NCS 1001
Cisco NCS 1002
Cisco NCS 1004 Firmware
Cisco NCS 5001 Firmware
Cisco NCS 5002

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Reference Links

Frequently Asked Questions

  • What is CVE-2019-15989?

    CVE-2019-15989 is a vulnerability in the implementation of the Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

  • How severe is CVE-2019-15989?

    CVE-2019-15989 has a severity rating of 8.6 (high).

  • Which software versions are affected by CVE-2019-15989?

    Cisco IOS XR Software versions 6.6.1 and 6.6.2 are affected by CVE-2019-15989.

  • How can I fix CVE-2019-15989?

    To mitigate CVE-2019-15989, it is recommended to apply the necessary updates or patches provided by Cisco.

  • Where can I find more information about CVE-2019-15989?

    More information about CVE-2019-15989 can be found on the Cisco Security Advisory page: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-dos

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