Vulnerability identifier: #VU20488

Vulnerability risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1962

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco NX-OS
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

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

The vulnerability exists due to insufficient validation of TCP packets when processed by the Cisco Fabric Services over IP (CFSoIP) feature. A remote attacker can send a malicious Cisco Fabric Services TCP packet, cause process crashes, resulting in a device reload and a DoS condition.

This vulnerability affects the following products that are running a Cisco NX-OS Software with CFSoIP enabled:

• MDS 9000 Series Multilayer Switches
• Nexus 3000 Series Switches
• Nexus 3500 Platform Switches
• Nexus 3600 Platform Switches
• Nexus 5500 Platform Switches
• Nexus 5600 Platform Switches
• Nexus 6000 Series Switches
• Nexus 7000 Series Switches
• Nexus 7700 Series Switches
• Nexus 9000 Series Switches in standalone NX-OS mode
• Nexus 9500 R-Series Switching Platform
• UCS 6200 Series Fabric Interconnects
• UCS 6300 Series Fabric Interconnects

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco NX-OS: 3.2 - 7.3

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nxos-fsip-dos

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.