Input validation error in Cisco FXOS and Cisco NX-OS - CVE-2019-1963

Vulnerability details

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

The vulnerability exists due to improper validation of Abstract Syntax Notation One (ASN.1)-encoded variables in SNMP packets. A remote authenticated attacker can send a specially crafted SNMP packet to the SNMP daemon and cause the SNMP application to restart multiple times, leading to a system-level restart and a denial of service (DoS) condition.

This vulnerability affects the following products if they have SNMP configured and they are running a vulnerable release of Cisco FXOS or NX-OS Software:

• Firepower 4100 Series
• Firepower 9300 Security Appliances
• MDS 9000 Series Multilayer Switches
• Nexus 1000 Virtual Edge for VMware vSphere
• Nexus 1000V Switch for Microsoft Hyper-V
• Nexus 1000V Switch for VMware vSphere
• 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 Fabric Switches in Application Centric Infrastructure (ACI) mode
• 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
• UCS 6400 Series Fabric Interconnects

Affected software

How to mitigate CVE-2019-1963

External References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-fxnxos-snmp-dos

Related Security Bulletins

• Multiple vulnerabilities in Cisco NX-OS Software