---
id: CVE-2022-20922
title: >-
  Multiple vulnerabilities in the Server Message Block Version 2 (SMB2)
  processor of the Snort detection engine on multiple Cisco products could allow
  an unauthenticated, remote attacker to bypass the configured policies or cause
  a denial …
summary: >-
  Multiple vulnerabilities in the Server Message Block Version 2 (SMB2)
  processor of the Snort detection engine on multiple Cisco products could allow
  an unauthenticated, remote attacker to bypass the configured policies or cause
  a denial …
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L'
cwe:
  - CWE-244
published: '2022-11-15'
updated: '2026-06-22'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-20922'
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-smb-3nfhJtr
    label: psirt@cisco.com
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-smb-3nfhJtr
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00822
epssPercentile: 0.55806
ingestedAt: '2026-06-29T13:24:33.502Z'
---

## Overview

Multiple vulnerabilities in the Server Message Block Version 2 (SMB2) processor of the Snort detection engine on multiple Cisco products could allow an unauthenticated, remote attacker to bypass the configured policies or cause a denial of service (DoS) condition on an affected device.

 These vulnerabilities are due to improper management of system resources when the Snort detection engine is processing SMB2 traffic. An attacker could exploit these vulnerabilities by sending a high rate of certain types of SMB2 packets through an affected device. A successful exploit could allow the attacker to trigger a reload of the Snort process, resulting in a DoS condition.

 Note: When the snort preserve-connection option is enabled for the Snort detection engine, a successful exploit could also allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network. The snort preserve-connection setting is enabled by default. See the Details ["#details"] section of this advisory for more information.

 Note: Only products that have Snort 3 configured are affected. Products that are configured with Snort 2 are not affected.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.