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Cisco issues critical security warning for Nexus data-center switches

Wilbert Doyle by Wilbert Doyle
June 17, 2025

Cisco issued some 40 protection advisories these days; however, only one in every one of them become deemed “important” – a vulnerability in the Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode facts-middle switch that could let an attacker secretly get entry to system assets.

The exposure was given a Common Vulnerability Scoring System significance of nine. Eight out of 10 is defined as a hassle with relaxed shell (SSH) key management for the Cisco Nexus 9000 that lets a faraway attacker connect to the affected system with the privileges of a root person, Cisco stated.

data-center switches

“A default SSH key pair causes the vulnerability. This is present in all devices. An attacker ought to make the most of this vulnerability byby opening an SSH connection via IPv6 to a targeted tool for using the extracted key substances. This vulnerability is only exploitable over IPv6; IPv4 is not vulnerable,” Cisco wrote.

This vulnerability affects Nexus 9000s if they’re jogging a Cisco NX-OS software program release before 14.1, and the employer said there had been no workarounds to address the problem. However, Cisco has launched free software updates that deal with vulnerability.

The company additionally issued a “high” safety warning advisory for the Nexus 9000. The advisory involves exploiting a vulnerability that could permit attackers to execute arbitrary operating-device commands as root on an affected tool. To prevail, an attacker might want valid administrator credentials for the tool, Cisco said.

Cisco wrote that the vulnerability is due to overly wide device-file permissions. An attacker could exploit this vulnerability by authenticating to an affected tool, growing a crafted command string, and writing this crafted string to a specific report area. Cisco has launched software updates that cope with this vulnerability.

Two different vulneraries rated “excessive” also concerned the Nexus 9000:

A vulnerability inside the background-operations capability of the Cisco Nexus 9000 software program should permit an authenticated, nearby attacker to benefit from accelerated privileges as root on an affected device. The vulnerability is caused by insufficient validation of person-supplied documents on an affected tool. Cisco said an attacker could take advantage of this vulnerability by logging in to the CLI of the affected tool and growing a crafted document in a particular listing on the filesystem.

A weakness inside the historical past-operations capability of the transfer software program could permit an attacker to log in to the CLI of the affected tool and create a crafted document in a selected directory in the filesystem. Cisco said the vulnerability is caused by inadequate validation of person-provided files on an affected device. Cisco has launched a software program for these vulnerabilities as well. Also, some “high” rated warnings about vulnerabilities in Cisco’s FirePower firewall collection have been a part of those safety signals.

For example, Cisco wrote that multiple vulnerabilities inside the Server Message Block Protocol preprocessor detection engine for Cisco Firepower Threat Defense Software might want to permit an unauthenticated, adjacent, or faraway attacker to reason a denial of service (DoS) circumstance.

Cisco stated that yet another vulnerability in the internal packet-processing capability of the Cisco Firepower software program for the Cisco Firepower 2100 Series should permit an unauthenticated, faraway attacker to cause an affected device to stop processing traffic, ensuing in a DOS state of affairs.

Software patches are available for these vulnerabilities. Other products, including the Cisco Adaptive Security Virtual Appliance and Web Security equipment, had excessive priority patches. Join the Network World groups on Facebook and LinkedIn to comment on subjects that are top of your mind.

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Wilbert Doyle

Wilbert Doyle

I am a technology freak, I love new technologies and gadgets. I am always ready to learn new things, so I can share this knowledge with other people. and I am really happy when people like my blogs.

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