Security Alerts

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These posts contain security alerts, including digital loopholes, electronic attacks, technical updates, and they are classified base on the level of severity.





Cisco Updates


Warning Date: 21 October, 2021

Severity Level ● Medium

Warning Number: 2021-3720

Target Sector: All


Cisco has released security updates to address several vulnerabilities in the following products:

  • Cisco IOS XE SD-WAN Software:
    • 1000 Series Integrated Services Routers (ISRs)
    • 4000 Series ISRs
    • ASR 1000 Series Aggregation Services Routers
    • Catalyst 8000 Series Edge Platforms
    • Cloud Services Router (CSR) 1000V Series
  • Cisco IOS XR Software
    • had the DHCPv4 server feature or the DHCPv4 proxy feature enabled:
    • Releases 6.7.2 and later
    • 7.1.2 and later, or 7.2.1 and later but earlier than Release 7.3.2 or earlier than Release 7.4.1
      • ASR 9000 Series Aggregation Services Routers
      • IOS XRv 9000 Routers
      • Network Convergence System (NCS) 540 Series Routers
      • NCS 560 Series Routers
      • NCS 5000 Series Routers
      • NCS 5500 Series Routers
  • Cisco Webex Software
  • Cisco TMS Software
  • Cisco Tetration
  • Cisco ISE Software
  • UCS C-Series Rack Servers in standalone mode
  • UCS S-Series Storage Servers in standalone mode
  • Cisco Meeting Server


Attacker could exploit these vulnerabilities by doing the following:

  • Cross-site scripting (XSS)
  • Authentication bypass
  • Install the restricted file remotely
  • Denial of Service (DoS)
  • Execute arbitrary code with root privileges

Best practice and Recommendations:

The CERT team encourages users to review Cisco security advisory and apply the necessary updates:

Last updated at 21 October, 2021

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