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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-15 · updated 2026-08-11
Weakness: CWE-190

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.

Affected products

Cisco Cyber Vision: 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5 (+11)
Cisco Firepower Threat Defense Software: 6.2.3, 6.2.3.1, 6.2.3.2, 6.2.3.3, 6.2.3.4, 6.2.3.5 (+38)
Cisco UTD SNORT IPS Engine Software: 3.17.0s, 3.17.1s, 16.6.1, 16.6.5, 16.6.6, 16.6.7a (+37)

References

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