Vulnerability · Published Jun 16, 2021 · Assigned by cisco
CVE-2021-1566Cisco Email Security Appliance and Cisco Web Security Appliance Certificate Validation Vulnerability
High 7.4
In plain English
A high-severity security flaw in Cisco Web Security Appliance (WSA) from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Web Security Appliance (WSA) | n/a |
Weakness: CWE-296 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- 20210616 Cisco Email Security Appliance and Cisco Web Security Appliance Certificate Validation Vulnerability vendor-advisory, x_refsource_CISCO