#VU50951 Out-of-bounds write in Cisco Systems, Inc products - CVE-2021-1368

Vulnerability identifier: #VU50951

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2021-1368

CWE-ID: CWE-787

Exploitation vector: Adjecent network

Exploit availability: No public exploit available

Vulnerable software:
Cisco Firepower 4100 Series Next-Generation Firewall
Firepower 9300 Series Security Appliances
UCS 6200 Series Fabric Interconnects
UCS 6300 Series Fabric Interconnects
UCS 6400 Series Fabric Interconnects
Cisco MDS 9000 Series Multilayer Switches
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

Software vendor:
Cisco Systems, Inc

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in the Unidirectional Link Detection (UDLD) feature. A remote attacker on the local network can trigger out-of-bounds write and execute arbitrary code on the target system.

Install updates from vendor's website.

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-udld-rce-xetH6w35