CVE-2021-1229: Cisco NX-OS Software ICMP Version 6 Memory Leak Denial of Service Vulnerability

First published: Wed Feb 24 2021(Updated: )

A vulnerability in ICMP Version 6 (ICMPv6) processing in Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a slow system memory leak, which over time could lead to a denial of service (DoS) condition. This vulnerability is due to improper error handling when an IPv6-configured interface receives a specific type of ICMPv6 packet. An attacker could exploit this vulnerability by sending a sustained rate of crafted ICMPv6 packets to a local IPv6 address on a targeted device. A successful exploit could allow the attacker to cause a system memory leak in the ICMPv6 process on the device. As a result, the ICMPv6 process could run out of system memory and stop processing traffic. The device could then drop all ICMPv6 packets, causing traffic instability on the device. Restoring device functionality would require a device reboot.

Credit: ykramarz@cisco.com

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• canonical/cisco nx-os
• version/cisco nx-os/5.2\(1\)sv5\(1.3a\)
• canonical/cisco nexus 1000 virtual edge
• canonical/cisco nexus 1000v for microsoft hyper-v
• canonical/cisco nexus 1000v for vmware vsphere
• version/cisco nx-os/8.4\(3.53\)
• canonical/cisco mds 9148s
• canonical/cisco mds 9250i
• canonical/cisco mds 9706 firmware
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• canonical/cisco nexus 3132c-z firmware
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• canonical/cisco nexus 3132q-x/3132q-xl
• canonical/cisco nexus 3164q firmware
• canonical/cisco nexus 3172pq/pq-xl
• canonical/cisco nexus 3232c
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• canonical/cisco nexus 34180yc firmware
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• canonical/cisco nexus 3524-xl
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• canonical/cisco nexus 92160yc switch
• canonical/cisco nexus 9221c firmware
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• canonical/cisco nexus 92348gc-x switch
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• canonical/cisco nexus 93180yc-fx3 firmware
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• canonical/cisco nexus 9332pq
• canonical/cisco nexus 93360yc-fx2
• canonical/cisco nexus 9336c-fx2 firmware
• canonical/cisco nexus 9336c-fx2-e firmware
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• version/cisco nx-os/15.1\(2.31\)