CVE-2021-1516: Cisco Content Security Management Appliance, Email Security Appliance, and Web Security Appliance Information Disclosure Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-06 · updated 2026-06-17
Weakness: CWE-540

Description

A vulnerability in the web-based management interface of Cisco AsyncOS Software for Cisco Content Security Management Appliance (SMA), Cisco Email Security Appliance (ESA), and Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to access sensitive information on an affected device. The vulnerability exists because confidential information is included in HTTP requests that are exchanged between the user and the device. An attacker could exploit this vulnerability by looking at the raw HTTP requests that are sent to the interface. A successful exploit could allow the attacker to obtain some of the passwords that are configured throughout the interface.

Affected products

Cisco Content Security Management Appliance (SMA): all versions
Cisco Email Security Appliance (ESA): all versions
Cisco IronPort Web Security Appliance: 13.6.2-023, 14.0.0-090, 14.0.0-133, 14.0.0-292, 14.0.0-300
Cisco Web Security Appliance (WSA): all versions

References

Get alerted when CVE-2021-1516 or the next vulnerability affects your stack