Out-of-bounds read in NX-OS Firmware used by IBM c-type SAN directors and switches

Published: 2023-01-24
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3712
Exploitation vector Network
Public exploit N/A
Vulnerable software
Cisco NX-OS
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Out-of-bounds read

EUVDB-ID: #VU56064

Risk: Medium


CVE-ID: CVE-2021-3712

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when processing ASN.1 strings related to a confusion with NULL termination of strings in array. A remote attacker can pass specially crafted data to the application to trigger an out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.


Install update from vendor's website.

Vulnerable software versions

Cisco NX-OS: before 9.3.2

CPE2.3 External links


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?