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

Medium 5.8 Published 6 Jul 2019 Updated 19 Nov 2024

Remote attackers can bypass email content filters by naming malicious attachments with specific patterns, allowing blocked files to pass through.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-1921?

CVE-2019-1921 is a medium-severity vulnerability in Cisco Email Security Appliance, published on 6 Jul 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-20

Which versions are affected by CVE-2019-1921?

It affects 1 product.

Products include Cisco Email Security Appliance.

How do I fix CVE-2019-1921?

No fix has been published for CVE-2019-1921 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-1921 being exploited?

There is no known exploitation of CVE-2019-1921 in the wild and no public exploit code.

All Cisco Email Security Appliance vulnerabilities

Sources

Also known as GHSA-q86h-wvjc-7wh4.