---
id: CVE-2019-1746
title: >-
  Cisco IOS and IOS XE Software Cluster Management Protocol Denial of Service
  Vulnerability (CVE-2019-1746)
summary: >-
  A vulnerability in the Cluster Management Protocol (CMP) processing code in
  Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated,
  adjacent attacker to trigger a denial of service (DoS) condition on an
  affected device…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'
cvssSource: vendor
vendor: Cisco
product: IOS
affected:
  - ios 12.2(46)EY
  - ios 12.2(50)SG3
  - ios 12.2(25)EWA5
  - ios 12.2(55)EY
  - ios 12.2(25)EWA1
  - ios 12.2(31)SG1
  - ios 12.2(53)SE1
  - ios 12.2(53)SG
  - ios 12.2(31)SG3
  - ios 12.2(25)SEF2
  - ios 12.2(25)EWA10
  - ios 12.2(55)SE
  - ios 12.2(50)SG6
  - ios 12.2(25)SE2
  - ios 12.2(53)SG1
  - ios 12.2(25)SEF3
  - ios 12.2(18)SO1
  - ios 12.2(40)SE2
  - ios 12.2(27)SBA4
  - ios 12.2(46)SE
  - ios 12.2(44)SQ
  - ios 15.0(1)XO1
  - ios 12.2(46)SG
  - ios 12.2(44)EX
  - ios 12.2(46)SE2
  - ios 12.2(44)SQ2
  - ios 12.2(25)SEC2
  - ios 12.2(50)SE2
  - ios 12.2(31)SGA3
  - ios 12.2(25)SG1
  - ios 12.2(35)SE5
  - ios 12.2(53)SG2
  - ios 12.2(52)XO
  - ios 12.2(25)EWA8
  - ios 12.2(25)EZ1
  - ios 12.2(50)SE1
  - ios 12.2(25)SEE4
  - ios 15.0(1)EY
  - ios 12.2(50)SQ2
  - ios 12.2(31)SGA2
published: '2019-03-27'
updated: '2019-03-27'
sourceUpdated: '2019-03-27T16:00:00+00:00'
source: CSAF
sourceUrl: >-
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-cmp-dos
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-cmp-dos
  - url: 'https://software.cisco.com'
tags:
  - csaf
  - vendor-advisory
  - cisco
epss: 0.0064
epssPercentile: 0.49454
ingestedAt: '2026-10-15T11:50:11.866Z'
---

## Overview

A vulnerability in the Cluster Management Protocol (CMP) processing code in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device.

The vulnerability is due to insufficient input validation when processing CMP management packets. An attacker could exploit this vulnerability by sending malicious CMP management packets to an affected device. A successful exploit could cause the switch to crash, resulting in a DoS condition. The switch will reload automatically.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-cmp-dos ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-cmp-dos"]

This advisory is part of the March 27, 2019, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes 17 Cisco Security Advisories that describe 19 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: March 2019 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-71135"].

## Vendor advisories

- **cisco-sa-20190327-cmp-dos** · Cisco · affected: IOS (483 versions), Cisco IOS XE Software (80 versions) · updated 2019-03-27 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-cmp-dos)

**Cisco IOS and IOS XE Software Cluster Management Protocol Denial of Service Vulnerability**. Released 2019-03-27.

Affected:

- IOS 12.2(46)EY
- IOS 12.2(50)SG3
- IOS 12.2(25)EWA5
- IOS 12.2(55)EY
- IOS 12.2(25)EWA1
- IOS 12.2(31)SG1
- IOS 12.2(53)SE1
- IOS 12.2(53)SG
- IOS 12.2(31)SG3
- IOS 12.2(25)SEF2
- IOS 12.2(25)EWA10
- IOS 12.2(55)SE
- IOS 12.2(50)SG6
- IOS 12.2(25)SE2
- IOS 12.2(53)SG1
- IOS 12.2(25)SEF3
- IOS 12.2(18)SO1
- IOS 12.2(40)SE2
- IOS 12.2(27)SBA4
- IOS 12.2(46)SE
- IOS 12.2(44)SQ
- IOS 15.0(1)XO1
- IOS 12.2(46)SG
- IOS 12.2(44)EX
- IOS 12.2(46)SE2
- IOS 12.2(44)SQ2
- IOS 12.2(25)SEC2
- IOS 12.2(50)SE2
- IOS 12.2(31)SGA3
- IOS 12.2(25)SG1
- IOS 12.2(35)SE5
- IOS 12.2(53)SG2
- IOS 12.2(52)XO
- IOS 12.2(25)EWA8
- IOS 12.2(25)EZ1
- IOS 12.2(50)SE1
- IOS 12.2(25)SEE4
- IOS 15.0(1)EY
- IOS 12.2(50)SQ2
- IOS 12.2(31)SGA2

## Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com