CVE-2019-1609: A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operat...

Description

A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system of an affected device. The vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability. MDS 9000 Series Multilayer Switches are affected in versions prior to 6.2(27), 8.1(1b), and 8.3(2). Nexus 3500 Platform Switches are affected in versions prior to 7.0(3)I7(6). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(6). Nexus 3600 Platform Switches are affected in versions prior to 7.0(3)F3(5). Nexus 7000 and 7700 Series Switches are affected in versions prior to 6.2(22), 7.3(3)D1(1), 8.2(3), and 8.3(2). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected in versions prior to 7.0(3)I4(9) and7.0(3)I7(6). Nexus 9500 R-Series Line Cards and Fabric Modules are affected in versions prior to 7.0(3)F3(5).

Metrics

CVSS 3.1

6.7/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.89%

54.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Nx-Os	>= 8.2, < 8.3\(2\)
Cisco	Nx-Os	>= 7.0\(3\), < 7.0\(3\)i7\(6\)
Cisco	Nx-Os	>= 7.0\(3\)i5, < 7.0\(3\)i7\(6\)
Cisco	Nx-Os	>= 7.0\(3\)f3, < 7.0\(3\)f3\(5\)
Cisco	Nx-Os	>= 8.3, < 8.3\(2\)
Cisco	Nx-Os	>= 7.0\(3\)f1, < 7.0\(3\)f3\(5\)
Cisco	Nx-Os	>= 7.3, < 8.1\(1b\)
Cisco	Nx-Os	>= 5.2, < 6.2\(27\)
Cisco	Nx-Os	< 7.0\(3\)i4\(9\)
Cisco	Nx-Os	>= 8.0, < 8.2\(3\)
Cisco	Nx-Os	>= 7.2, < 7.3\(3\)d1\(1\)
Cisco	Nx-Os	< 6.2\(22\)

References

http://www.securityfocus.com/bid/107341Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-cmdinj-1609Patch, Vendor Advisory
http://www.securityfocus.com/bid/107341Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-cmdinj-1609Patch, Vendor Advisory

Timeline

Published: Mar 8, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-1609?

A vulnerability in the CLI of Cisco NX-OS Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system of an affected device. The vulnerability is due to insufficient validation of arguments passed to certain CLI commands. An attacker could exploit this vulnerability by including malicious input as the argument of an affected command. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with elevated privileges. An attacker would need valid administrator credentials to exploit this vulnerability. MDS 9000 Series Multilayer Switches are affected in versions prior to 6.2(27), 8.1(1b), and 8.3(2). Nexus 3500 Platform Switches are affected in versions prior to 7.0(3)I7(6). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(6). Nexus 3600 Platform Switches are affected in versions prior to 7.0(3)F3(5). Nexus 7000 and 7700 Series Switches are affected in versions prior to 6.2(22), 7.3(3)D1(1), 8.2(3), and 8.3(2). Nexus 9000 Series Switches in Standalone NX-OS Mode are affected in versions prior to 7.0(3)I4(9) and7.0(3)I7(6). Nexus 9500 R-Series Line Cards and Fabric Modules are affected in versions prior to 7.0(3)F3(5).

How severe is CVE-2019-1609?

CVE-2019-1609 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2019-1609?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.