#VU24520 Resource management error in Cisco IOS XR - CVE-2019-16021 

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Main Vulnerability Database Vulnerabilities #VU24520

#VU24520 Resource management error in Cisco IOS XR - CVE-2019-16021

Published: January 24, 2020


Vulnerability identifier: #VU24520
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2019-16021
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Cisco IOS XR
Software vendor:
Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of Border Gateway Protocol (BGP) update messages that contain crafted Ethernet VPN (EVPN) attributes. A remote attacker can send specially crafted Multicast Leave Source update messages and perform a denial of service attack.


Remediation

This vulnerability has been patched in the following patches only:

  • ncs5500-6.6.1.CSCvr91660
  • asr9k-x64-6.6.1.CSCvr91660
  • ncs540-6.6.1.CSCvr91660
  • ncs6k-6.6.1.CSCvr91660
  • asr9k-px-6.6.2.CSCvr91676
  • asr9k-x64-6.6.2.CSCvr91676
  • xrv9k-6.6.2.CSCvr91676
  • ncs560-6.6.25.CSCvr91676
  • ncs5500-6.6.25.CSCvr91676
  • asr9k-x64-7.0.1.CSCvr91676

External links