What is CVE-2020-3133?

CVE-2020-3133 is a vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) that allows an unauthenticated, remote attacker to bypass configured filters on the device.

What is the severity of CVE-2020-3133?

CVE-2020-3133 has a severity rating of 7.5 (High).

How does CVE-2020-3133 impact Cisco Email Security Appliance?

CVE-2020-3133 impacts Cisco Email Security Appliance by allowing an attacker to bypass configured filters on the device.

How can an attacker exploit CVE-2020-3133?

An attacker can exploit CVE-2020-3133 by sending maliciously crafted emails that bypass the email message scanning and configured filters on the Cisco Email Security Appliance.

Is there a fix for CVE-2020-3133?

Yes, Cisco has released a software update to address the vulnerability. Please refer to the Cisco security advisory for more information.

Vulnerability/
CVE-2020-3133

high

7.5

CWE

23/9/2020

16/9/2024

CVE-2020-3133: Cisco Email Security Appliance Content Filter Bypass Vulnerability

First published: Wed Sep 23 2020(Updated: )

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 filters on the device. The vulnerability is due to improper validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email message to a recipient protected by the ESA. A successful exploit could allow the attacker to bypass the configured content filters, which could allow malicious content to pass through the device.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco Email Security Appliance	<13.0

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-bypass-5Cdv2HMA

Frequently Asked Questions

What is CVE-2020-3133?
CVE-2020-3133 is a vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) that allows an unauthenticated, remote attacker to bypass configured filters on the device.
What is the severity of CVE-2020-3133?
CVE-2020-3133 has a severity rating of 7.5 (High).
How does CVE-2020-3133 impact Cisco Email Security Appliance?
CVE-2020-3133 impacts Cisco Email Security Appliance by allowing an attacker to bypass configured filters on the device.
How can an attacker exploit CVE-2020-3133?
An attacker can exploit CVE-2020-3133 by sending maliciously crafted emails that bypass the email message scanning and configured filters on the Cisco Email Security Appliance.
Is there a fix for CVE-2020-3133?
Yes, Cisco has released a software update to address the vulnerability. Please refer to the Cisco security advisory for more information.

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