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