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CVE-2022-20685

Multiple Cisco Products Snort Modbus Denial of Service Vulnerability

Published: Nov 15, 2024Updated: Jun 24, 2025 Sources: CVE List NVD BDUCWE-190
NVD MITRE
7.5CVSSHIGH
EPSS Score
1.4%
Top 31.3%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-190

Affected Products

Firepower Threat DefenseCisco Systems Inc.Networking Infrastructure
SnortCisco Systems Inc.Networking Infrastructure
Cisco Meraki MXCisco Systems Inc.Networking Infrastructure
Cisco Cyber VisionCiscoNetworking Infrastructure
Cisco Firepower Threat Defense SoftwareCiscoNetworking Infrastructure
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.
and 4 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-9D3hJLuj?vsfCisco20Security20AdvisoryvscatSecurity20IntelligencevstypeRSSvspMultiple20Cisco20Products20Snort20Modbus20Denial20of20Service20Vulnerabilityvsk1
tools.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-dos-9D3hJLuj
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sna-xss-NXOxDhRQ
sec.cloudapps.cisco.com

Timeline

Published
Nov 15, 2024
Last Updated
Jun 24, 2025

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