CVE-2022-20685: Cisco Cyber Vision

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco Cyber Vision: version 3.0.0 only; version 3.0.1 only; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; version 3.0.5 only; …
• Cisco Secure Firewall Threat Defense: version 6.2.3 only; version 6.2.3.1 only; version 6.2.3.2 only; version 6.2.3.3 only; version 6.2.3.4 only; version 6.2.3.5 only; …
• Cisco Unified Threat Defense Snort Intrusion Prevention System Engine: version 3.17.0s only; version 3.17.1s only; version 16.6.1 only; version 16.6.5 only; version 16.6.6 only; version 16.6.7a only; …

Published 2024-11-15. Last modified 2026-08-11.