Main Vulnerability Database Vulnerabilities #VU56103

Input validation error in Cisco Systems, Inc products - CVE-2021-1523

Published: August 26, 2021

Vulnerability identifier: #VU56103

CSH Severity: Medium

CVSS v4: 8.7 [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]

CVE-ID: CVE-2021-1523

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to mishandling of ingress TCP traffic to a specific port. A remote attacker can send a specially crafted TCP packet and perform a denial of service (DoS) attack.

Affected software

N9K-C9372PX-E
N9K-C9372TX-E
N9K-C9332PQ
N9K-C9372PX
N9K-C9372TX
N9K-C9396PX
N9K-C9396TX
N9K-C93128TX
N9K-C93120TX
Cisco Nexus 9000 Series Switches

How to mitigate CVE-2021-1523

Install updates from vendor's website.

Cisco Nexus 9000 Series Switches - addressed in versions 13.2.10e, 13.2.10f, 14.2.7f, 14.2.7l, 15.1.3e, 15.1.4c, 15.2.1g, 15.2.2e, 15.2.2f

External References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-queue-wedge-cLDDEfKF

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