Summary

• A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker to execute a command injection attack on the underlying operating system of an affected device. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.

  This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by entering crafted input as the argument of an affected CLI command. A successful exploit could allow the attacker to read and write files on the underlying operating system with the privileges of a non-root user account. File system access is limited to the permissions that are granted to that non-root user account.

  Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

  This advisory is available at the following link:
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cmdinj-qhNze5Ss

  This advisory is part of the August 2025 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2025 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

Affected Products

• Vulnerable Products

  At the time of publication, this vulnerability affected the following Cisco products, regardless of device configuration:

  • MDS 9000 Series Multilayer Switches (CSCwn39942)
  • Nexus 1000 Virtual Edge for VMware vSphere (CSCwo71696)
  • Nexus 3000 Series Switches (CSCwn39953)
  • Nexus 5500 Platform Switches (CSCwn39958)
  • Nexus 5600 Platform Switches (CSCwn39958)
  • Nexus 6000 Series Switches (CSCwn39958)
  • Nexus 7000 Series Switches (CSCwn39955)
  • Nexus 9000 Series Fabric Switches in ACI mode (CSCwn39957)
  • Nexus 9000 Series Switches in standalone NX-OS mode (CSCwn39953)
  • UCS 6400 Series Fabric Interconnects (CSCwm88173)
  • UCS 6500 Series Fabric Interconnects (CSCwm88173)

  • UCS X-Series Direct Fabric Interconnect 9108 100G (CSCwm88173)

  For information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.

  Products Confirmed Not Vulnerable

  Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.

  Cisco has confirmed that this vulnerability does not affect the following Cisco products:

  • Firepower 1000 Series
  • Firepower 2100 Series
  • Firepower 4100 Series
  • Firepower 9300 Security Appliances
  • Secure Firewall 3100 Series
  • Secure Firewall 4200 Series
  • UCS 6300 Series Fabric Interconnects

Workarounds

• There are no workarounds that address this vulnerability.

Fixed Software

• When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.

  In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.

  Cisco NX-OS Software

  To help customers determine their exposure to vulnerabilities in Cisco NX-OS Software, Cisco provides the Cisco Software Checker. This tool identifies any Cisco security advisories that impact a specific software release and the earliest release that fixes the vulnerabilities that are described in each advisory (“First Fixed”). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories that the Software Checker identifies (“Combined First Fixed”).

  To use the tool, go to the Cisco Software Checker page and follow the instructions. Alternatively, use the following form to search for vulnerabilities that affect a specific software release. To use the form, follow these steps:

  1. Choose which advisories the tool will search—only this advisory, only advisories with a Critical or High Security Impact Rating (SIR), or all advisories.
  2. Choose the appropriate software.
  3. Choose the appropriate platform.
  4. Enter a release number—for example, 10.4(4) for Cisco Nexus 3000 Series Switches or 16.0(8e) for Cisco NX-OS Software in ACI mode.
  5. Click Check.

   

  Only this advisory All Critical and High advisories All advisories Cisco NX-OS Software Cisco NX-OS Software in ACI Mode Any Platform MDS 9000 Series Multilayer Switches Nexus 1000V Series Switches Nexus 3000 Series Switches Nexus 5000 Series Switches Nexus 6000 Series Switches Nexus 7000 Series Switches Nexus 9000 Series Switches

   

   

  Cisco UCS Software

  At the time of publication, the release information in the following tables was accurate. See the details of the bug ID(s) at the top of this advisory for the most complete and current information.

  The left column lists Cisco software releases, and the center and right columns indicate whether a release was affected by the vulnerability described in this advisory and which release included the fix for this vulnerability.

  UCS 6400 and 6500 Series Fabric Interconnects

  Cisco UCS Software Release	First Fixed Release for UCS Manager Mode	First Fixed Release for Intersight Managed Mode
  4.1 and earlier	Migrate to a fixed release.	Migrate to a fixed release.
  4.2	4.2(3p)	4.2(3p)
  4.3	4.3(6a)	4.3(6.250048)
  6.0	Not vulnerable.	Not vulnerable.

  UCS X-Series Direct Fabric Interconnect 9108 100G

  Cisco UCS Software Release	First Fixed Release for UCS Manager Mode	First Fixed Release for Intersight Managed Mode
  4.3	4.3(6a)	4.3(6.250094)
  6.0	Not vulnerable.	Not vulnerable.

  The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.

  Additional Resources

  For help determining the best Cisco NX-OS Software release for a Cisco Nexus Switch, see the following Recommended Releases documents. If a security advisory recommends a later release, Cisco recommends following the advisory guidance.

  Cisco MDS Series Switches
  Cisco Nexus 3000 Series Switches
  Cisco Nexus 5500 Platform Switches
  Cisco Nexus 5600 Platform Switches
  Cisco Nexus 6000 Series Switches
  Cisco Nexus 7000 Series Switches
  Cisco Nexus 9000 Series Switches
  Cisco Nexus 9000 Series ACI-Mode Switches

  To determine the best release for Cisco UCS Software, see the Recommended Releases documents in the release notes for the device.

Exploitation and Public Announcements

• The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

Source

• This vulnerability was found during internal security testing.

URL

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-cmdinj-qhNze5Ss

Revision History

• Version	Description	Section	Status	Date
  1.0	Initial public release.	—	Final	2025-AUG-27

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