What is CVE-2019-1921?

CVE-2019-1921 is a vulnerability in the attachment scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) that could allow an unauthenticated, remote attacker to bypass configured content filters on the device.

What is the severity of CVE-2019-1921?

The severity of CVE-2019-1921 is high, with a severity value of 7.5.

How does CVE-2019-1921 affect Cisco Email Security Appliance?

CVE-2019-1921 affects Cisco Email Security Appliance running version 12.0.0-419.

How can an attacker exploit CVE-2019-1921?

An attacker can exploit CVE-2019-1921 by sending a specially crafted email to the target device, bypassing content filters.

What is the recommended action to mitigate CVE-2019-1921?

To mitigate CVE-2019-1921, users should upgrade to a fixed software release.

Vulnerability/
CVE-2019-1921

high

7.5

CWE

6/7/2019

16/9/2024

CVE-2019-1921: Cisco Email Security Appliance Content Filter Bypass Vulnerability

First published: Sat Jul 06 2019(Updated: )

A vulnerability in the attachment 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 naming a malicious attachment with a specific pattern. A successful exploit could allow the attacker to bypass configured content filters that would normally block the attachment.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco Email Security Appliance	=12.0.0-419

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-esa-bypass

Frequently Asked Questions

What is CVE-2019-1921?
CVE-2019-1921 is a vulnerability in the attachment scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) that could allow an unauthenticated, remote attacker to bypass configured content filters on the device.
What is the severity of CVE-2019-1921?
The severity of CVE-2019-1921 is high, with a severity value of 7.5.
How does CVE-2019-1921 affect Cisco Email Security Appliance?
CVE-2019-1921 affects Cisco Email Security Appliance running version 12.0.0-419.
How can an attacker exploit CVE-2019-1921?
An attacker can exploit CVE-2019-1921 by sending a specially crafted email to the target device, bypassing content filters.
What is the recommended action to mitigate CVE-2019-1921?
To mitigate CVE-2019-1921, users should upgrade to a fixed software release.

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version/cisco email security appliance/12.0.0-419

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