Tuesday, August 31, 2021

Cisco NX-OS: CVE-2021-1590: Cisco NX-OS Software system login block-for Denial of Service Vulnerability

Description
A vulnerability in the implementation of the system login block-for command for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a login process to unexpectedly restart, causing a denial of service (DoS) condition. This vulnerability is due to a logic error in the implementation of the system login block-for command when an attack is detected and acted upon. An attacker could exploit this vulnerability by performing a brute-force login attack on an affected device. A successful exploit could allow the attacker to cause a login process to reload, which could result in a delay during authentication to the affected device.
Solution(s)
  • update-nxos


  • References
  • https://attackerkb.com/topics/cve-2021-1590
  • CVE - 2021-1590
  • https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-login-blockfor-RwjGVEcu




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