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  • Cisco disclosed two critical vulnerabilities (CVE-2023-20198 and CVE-2023-20273) affecting Cisco IOS XE software that could allow attackers to gain full control of affected devices.
  • The vulnerabilities affect devices with the HTTP server feature exposed to the internet. Cisco urged customers to disable HTTP on externally facing devices.
  • Cisco first detected suspicious activity exploiting CVE-2023-20198 on September 28. Attackers were creating local admin accounts on routers.
  • On October 12, Cisco observed more attacks creating local accounts and deploying an implant script to maintain access. The implant allows running arbitrary commands.
  • Over 40,000 internet-facing Cisco IOS devices were found to be compromised by the vulnerabilities as of October 19.
  • The attacks are believed to be carried out by the same actor. The threat actor tried to cover their tracks by clearing logs and removing created accounts.
  • Cisco scored CVE-2023-20198 a CVSS 10.0 (critical severity) and CVE-2023-20273 a CVSS 7.2 (high severity).
  • Patches for both vulnerabilities are estimated to be released on October 22 per Cisco's latest update.
  • Cisco and CISA have provided mitigation advice for customers including disabling HTTP, updating devices, and reporting compromised systems.