CVE-2019-1962: A vulnerability in the Cisco Fabric Services component of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause process crashe...

Description

A vulnerability in the Cisco Fabric Services component of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause process crashes, which can result in a denial of service (DoS) condition on an affected system. The vulnerability is due to insufficient validation of TCP packets when processed by the Cisco Fabric Services over IP (CFSoIP) feature. An attacker could exploit this vulnerability by sending a malicious Cisco Fabric Services TCP packet to an affected device. A successful exploit could allow the attacker to cause process crashes, resulting in a device reload and a DoS condition. Note: There are three distribution methods that can be configured for Cisco Fabric Services. This vulnerability affects only distribution method CFSoIP, which is disabled by default. See the Details section for more information.

Metrics

EPSS Probability

1.93%

77.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Nx-Os	>= 5.2, < 6.2\(29\)
Cisco	Nx-Os	>= 7.3, < 8.1
Cisco	Nx-Os	>= 7.0\(3\)f, < 9.2
Cisco	Nx-Os	< 7.1\(5\)n1\(1b\)
Cisco	Nx-Os	>= 7.3, < 7.3\(5\)n1\(1\)
Cisco	Nx-Os	< 6.2\(22\)
Cisco	Nx-Os	>= 7.2, < 7.3\(4\)d1\(1\)
Cisco	Nx-Os	< 7.0\(3\)i4\(9\)
Cisco	Nx-Os	>= 7.0\(3\)i7, < 7.0\(3\)i7\(6\)
Cisco	Nx-Os	< 6.0\(2\)a8\(11\)
Cisco	Nx-Os	< 3.2\(3i\)
Cisco	Nx-Os	>= 4.0, < 4.0\(2d\)

References

Timeline

Published: Aug 28, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-1962?

A vulnerability in the Cisco Fabric Services component of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause process crashes, which can result in a denial of service (DoS) condition on an affected system. The vulnerability is due to insufficient validation of TCP packets when processed by the Cisco Fabric Services over IP (CFSoIP) feature. An attacker could exploit this vulnerability by sending a malicious Cisco Fabric Services TCP packet to an affected device. A successful exploit could allow the attacker to cause process crashes, resulting in a device reload and a DoS condition. Note: There are three distribution methods that can be configured for Cisco Fabric Services. This vulnerability affects only distribution method CFSoIP, which is disabled by default. See the Details section for more information.

How severe is CVE-2019-1962?

Severity scoring for CVE-2019-1962 is pending analysis. The EPSS model estimates a 1.93% probability of exploitation in the next 30 days.

How do I fix CVE-2019-1962?

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.