CVE-2020-3134 Cisco Email Security Appliance Zip Decompression Engine Denial of Service Vulnerability

Medium 6.5 Published 26 Jan 2020 Updated 15 Nov 2024

Remote attackers can cause a denial of service on Cisco Email Security Appliances by sending emails with crafted zip attachments, requiring an upgrade to fix.

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-2020-3134?

CVE-2020-3134 is a medium-severity denial of service vulnerability in Cisco Email Security Appliance, published on 26 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of zip files. An attacker could exploit this vulnerability by sending an email message with a crafted zip-compressed attachment. A successful exploit could trigger a restart of the content-scanning process, causing a temporary DoS condition. This vulnerability affects Cisco AsyncOS Software for Cisco ESA releases earlier than 13.0.

Weakness: CWE-20

Which versions are affected by CVE-2020-3134?

It affects 1 product.

Products include Cisco Email Security Appliance.

How do I fix CVE-2020-3134?

No fix has been published for CVE-2020-3134 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-3134 being exploited?

There is no known exploitation of CVE-2020-3134 in the wild and no public exploit code.

All Cisco Email Security Appliance vulnerabilities

Sources

Also known as GHSA-gf7w-86p9-r93x.