CVE-2021-1566 : faille élevée cisco email security appliance (CVSS 7.4)

A vulnerability in the Cisco Advanced Malware Protection (AMP) for Endpoints integration of Cisco AsyncOS for Cisco Email Security Appliance (ESA) and Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to intercept traffic between an affected device and the AMP servers. This vulnerability is due to improper certificate validation when an affected device establishes TLS connections. A man-in-the-middle attacker could exploit this vulnerability by sending a crafted TLS packet to an affected device. A successful exploit could allow the attacker to spoof a trusted host and then extract sensitive information or alter certain API requests.

Sévérité

Élevée (CVSS 7.4)

Vecteur CVSS

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation active

Non signalée par la CISA

Publication

16 juin 2021

Dernière mise à jour

17 juin 2026

• cisco email security appliance
• cisco asyncos
• cisco web security appliance

• Fiche CVE-2021-1566 sur le NVD (NIST)
• tools.cisco.com/security/center/content/CiscoSecurityAdvisory/…