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Rewterz Threat Advisory – ICS: Advantech WebAccess BwFLApp Stack-based Buffer Overflow Remote Code Execution

Severity

High

Analysis Summary

CVE-2021-20594

A remote attacker can leverage a brute-force attack to acquire legitimate usernames registered in the module.

CVE-2021-20597

A remote attacker could obtain unprotected credentials by sniffing network traffic.

CVE-2021-20598

A remote attacker could lock out a legitimate user by continually attempting to login with a known username and incorrect passwords.

Impact

  • Unauthorized Access
  • Credential Theft

Affected Vendors

  • Mitsubishi Electric

Affected Products

  • R08/16/32/120SFCPU: All versions
  • R08/16/32/120PSFCPU: All versions

Remediation

Refer to Cert-Cisa Advisory for the patch, upgrade, or suggested workaround information.

https://us-cert.cisa.gov/ics/advisories/icsa-21-250-01