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Rewterz Threat Advisory – Cisco Small Business 220 Series Smart Switches Vulnerability

June 17, 2021
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Rewterz Threat Advisory – Cisco Email Security Appliance and Cisco Web Security Appliance Certificate Validation Vulnerability

Severity

High

Analysis Summary

CVE-2021-1566

Cisco Email Security Appliance (ESA) and Web Security Appliance (WSA) are vulnerable to a man-in-the-middle attack, caused by improper certificate validation when establishes TLS connections. An attacker could exploit this vulnerability to launch a man-in-the-middle attack and gain access to the communication channel between endpoints to spoof a trusted host and then extract sensitive information or alter certain API requests.

Impact

  • Gain Access
  • Information Theft

Affected Vendors

Cisco

Affected Products

Cisco Email Security Appliance (ESA)
Cisco Web Security Appliance (WSA)

Remediation

Upgrade to the Cisco Small Business 220 Series Smart Switches firmware releases 1.2.0.6 and later from https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-wsa-cert-vali-n8L97RW

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