#VU50943 Memory leak in Cisco Systems, Inc products - CVE-2021-1387

Vulnerability identifier: #VU50943

Vulnerability risk: Medium

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:Green

CVE-ID: CVE-2021-1387

CWE-ID: CWE-401

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
Cisco Nexus 3000 Series Switches
Nexus 5500 Platform Switches
Nexus 5600 Platform Switches
Nexus 6000 Series Switches
Nexus 7000 Series Switches
Cisco Nexus 9000 Series Switches NX-OS Mode
UCS 6400 Series Fabric Interconnects

Software vendor:
Cisco Systems, Inc

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in the network stack. A remote attacker can send multiple crafted IPv6 packets to leak memory and perform denial of service attack.

Install updates from vendor's website.

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipv6-netstack-edXPGV7K
• https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu11961
• https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu77380