CVE-2019-1831: Cisco Email Security Appliance

Medium severity, CVSS 5.3. EPSS: 1.6% chance of exploitation in the next 30 days.

A vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass configured content filters on the device. The vulnerability is due to improper input validation of the email body. An attacker could exploit this vulnerability by inserting specific character strings in the message. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email.

Affected products

• Cisco Email Security Appliance: version 11.1.2-023 only; version 12.0.0-208 only

Published 2019-04-18. Last modified 2026-06-17.