CVE-2022-20685: A vulnerability in the Modbus preprocessor of the Snort detection engine could allow an unauthenticated, remote attacker to cause a denial of service ...

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.39%

69.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Cyber Vision	3.0.0
Cisco	Cyber Vision	3.0.1
Cisco	Cyber Vision	3.0.2
Cisco	Cyber Vision	3.0.3
Cisco	Cyber Vision	3.0.4
Cisco	Cyber Vision	3.0.5
Cisco	Cyber Vision	3.0.6
Cisco	Cyber Vision	3.1.0
Cisco	Cyber Vision	3.1.1
Cisco	Cyber Vision	3.1.2
Cisco	Cyber Vision	3.2.0
Cisco	Cyber Vision	3.2.1
Cisco	Cyber Vision	3.2.2
Cisco	Cyber Vision	3.2.3
Cisco	Cyber Vision	3.2.4
Cisco	Cyber Vision	4.0.0
Cisco	Cyber Vision	4.0.1
Cisco	Firepower Threat Defense	6.2.3
Cisco	Firepower Threat Defense	6.2.3.1
Cisco	Firepower Threat Defense	6.2.3.2
Cisco	Firepower Threat Defense	6.2.3.3
Cisco	Firepower Threat Defense	6.2.3.4
Cisco	Firepower Threat Defense	6.2.3.5
Cisco	Firepower Threat Defense	6.2.3.6
Cisco	Firepower Threat Defense	6.2.3.7
Cisco	Firepower Threat Defense	6.2.3.8
Cisco	Firepower Threat Defense	6.2.3.9
Cisco	Firepower Threat Defense	6.2.3.10
Cisco	Firepower Threat Defense	6.2.3.11
Cisco	Firepower Threat Defense	6.2.3.12
Cisco	Firepower Threat Defense	6.2.3.13
Cisco	Firepower Threat Defense	6.2.3.14
Cisco	Firepower Threat Defense	6.2.3.15
Cisco	Firepower Threat Defense	6.2.3.16
Cisco	Firepower Threat Defense	6.2.3.17
Cisco	Firepower Threat Defense	6.2.3.18
Cisco	Firepower Threat Defense	6.4.0
Cisco	Firepower Threat Defense	6.4.0.1
Cisco	Firepower Threat Defense	6.4.0.2
Cisco	Firepower Threat Defense	6.4.0.3
Cisco	Firepower Threat Defense	6.4.0.4
Cisco	Firepower Threat Defense	6.4.0.5
Cisco	Firepower Threat Defense	6.4.0.6
Cisco	Firepower Threat Defense	6.4.0.7
Cisco	Firepower Threat Defense	6.4.0.8
Cisco	Firepower Threat Defense	6.4.0.9
Cisco	Firepower Threat Defense	6.4.0.10
Cisco	Firepower Threat Defense	6.4.0.11
Cisco	Firepower Threat Defense	6.4.0.12
Cisco	Firepower Threat Defense	6.6.0

Showing 50 of 104 affected configurations. See NVD for the full list.

References

Timeline

Published: Nov 15, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2022-20685?

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.

How severe is CVE-2022-20685?

CVE-2022-20685 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.39% probability of exploitation in the next 30 days.

How do I fix CVE-2022-20685?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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