medium
5.8
CWE
401
Advisory Published
Updated

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

Affected SoftwareAffected VersionHow to fix
Cisco NX-OS=5.2\(1\)sv5\(1.3a\)
Cisco Nexus 1000 Virtual Edge
Cisco Nexus 1000V for Microsoft Hyper-V
Cisco Nexus 1000V for VMware vSphere
Cisco NX-OS=8.4\(3.53\)
Cisco MDS 9148S
Cisco MDS 9250i
Cisco MDS 9706 Firmware
Cisco MDS 9710 Firmware
Cisco Nexus 3048 Firmware
Cisco Nexus 31108PV-V Firmware
Cisco Nexus 31108TC-V Firmware
Cisco Nexus 31128PQ
Cisco Nexus 3132C-Z Firmware
Cisco Nexus 3132Q-V Firmware
Cisco Nexus 3132Q-X/3132Q-XL
Cisco Nexus 3132Q-XL Firmware
Cisco Nexus 3164Q Firmware
Cisco Nexus 3172PQ/PQ-XL
Cisco Nexus 3172PQ-XL Firmware
Cisco Nexus 3232C
Cisco Nexus 3264C-E Firmware
Cisco Nexus 3264Q Firmware
Cisco Nexus 3408-S Firmware
Cisco Nexus 34180YC Firmware
Cisco Nexus 3432D-S Firmware
Cisco Nexus 3464C Firmware
Cisco Nexus 3524-xl
Cisco Nexus 3524-X/XL
Cisco Nexus 3548-X/XL
Cisco Nexus 3548-X/XL
Cisco Nexus 36180YC-R Firmware
Cisco Nexus 3636C-R Firmware
Cisco Nexus 5548P Firmware
Cisco Nexus 5548UP Firmware
Cisco Nexus 5596T Firmware
Cisco Nexus 5596UP Firmware
Cisco 56128p
Cisco Nexus 5624Q Firmware
Cisco Nexus 5648Q Firmware
Cisco Nexus 5672UP-16G
Cisco Nexus 5672UP-16G Firmware
Cisco Nexus 5696Q Firmware
Cisco Nexus 6001 Firmware
Cisco Nexus 6004 Firmware
Cisco Nexus 7000 Series Switch
Cisco Nexus 7700 Series Switch
Cisco NX-OS Nexus 9000 Series
Cisco Nexus 92160YC Switch
Cisco Nexus 9221C Firmware
Cisco Nexus 92300YC Firmware
Cisco Nexus 92304QC Firmware
Cisco Nexus 92348GC-X Switch
Cisco Nexus 9236C
Cisco Nexus 9272Q Switch
Cisco Nexus
Cisco Nexus 93108TC-EX-24 Firmware
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93120TX Firmware
Cisco Nexus 93128TX
Cisco Nexus 9316D-GX Firmware
Cisco Nexus 9000 Series Switch
Cisco Nexus 93180YC-EX-24
Cisco Nexus 93180YC-EX-24 Firmware
Cisco Nexus 93180YC-FX Firmware
Cisco Nexus 93180YC-FX-24 Firmware
Cisco Nexus 93180YC-FX3 Firmware
Cisco Nexus 93180YC-FX3S Firmware
Cisco Nexus 93216TC-FX2 Firmware
Cisco Nexus 93240YC-FX2 Firmware
Cisco Nexus 9332PQ Firmware
Cisco Nexus 93360YC-FX2
Cisco Nexus 9336C-FX2 Firmware
Cisco Nexus 9336C-FX2-E Firmware
Cisco Nexus N9336PQ
Cisco Nexus 9348GC-FXP Firmware
Cisco Nexus 93600CD-GX Firmware
Cisco Nexus 9364c-h1
Cisco Nexus 9364C-GX Firmware
Cisco Nexus 9372PX-E
Cisco Nexus 9372PX-E Firmware
Cisco Nexus 9372TX Firmware
Cisco Nexus 9372TX-E Switch
Cisco Nexus 9396PX Firmware
Cisco Nexus 9396TX Firmware
Cisco Nexus 9508
Cisco NX-OS=15.1\(2.31\)

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-1229?

    CVE-2021-1229 has a severity rating of Medium, indicating potential for a denial of service (DoS) due to a memory leak.

  • How do I fix CVE-2021-1229?

    To fix CVE-2021-1229, upgrade to a patched version of Cisco NX-OS software that addresses this vulnerability.

  • What types of systems are affected by CVE-2021-1229?

    CVE-2021-1229 affects Cisco NX-OS Software, specifically versions 5.2(1)sv5(1.3a) and 8.4(3.53).

  • Can CVE-2021-1229 be exploited remotely?

    Yes, CVE-2021-1229 can be exploited by an unauthenticated, remote attacker.

  • What impact does CVE-2021-1229 have on network performance?

    CVE-2021-1229 can cause a slow memory leak that may lead to degraded system performance and a potential denial of service.

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