CVE-2022-20685 Multiple Cisco Products Snort Modbus Denial of Service Vulnerability

High 7.5 Published 15 Nov 2024 Updated 27 Jan 2025

An unauthenticated remote attacker can cause a denial of service by sending crafted Modbus traffic, hanging the Snort process and stopping traffic inspection.

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-2022-20685?

CVE-2022-20685 is a high-severity vulnerability in Cisco Secure Firewall Threat Defense, published on 15 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Modbus preprocessor of the Snort detection engine could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to an integer overflow while processing Modbus traffic. An attacker could exploit this vulnerability by sending crafted Modbus traffic through an affected device. A successful exploit could allow the attacker to cause the Snort process to hang, causing traffic inspection to stop.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

Weakness: CWE-190

Which versions are affected by CVE-2022-20685?

It affects 3 products.

Products include Cisco Cyber Vision, Cisco Secure Firewall Threat Defense, Cisco Unified Threat Defense Snort Intrusion Prevention System Engine.

How do I fix CVE-2022-20685?

No fix has been published for CVE-2022-20685 yet. Limit exposure of the affected software until one is available.

Is CVE-2022-20685 being exploited?

There is no known exploitation of CVE-2022-20685 in the wild and no public exploit code.

All Cisco Secure Firewall Threat Defense vulnerabilities

Sources

Also known as GHSA-5pj6-3hcq-wv78.