---
id: CVE-2021-1529
title: Cisco IOS XE SD-WAN Software Command Injection Vulnerability (CVE-2021-1529)
summary: "A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges.\r\n\r\nThe vulnerability is due to insufficient input validation by the system CLI. An …"
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
vendor: Cisco
product: Cisco 4000 Series Integrated Services Routers
affected:
  - 1000_series_integrated_services_routers
  - asr_1000_series_aggregation_services_routers
  - 4000_series_integrated_services_routers
  - integrated_services_virtual_router
  - cloud_services_router_1000v_series
  - catalyst_ir1100_rugged_series_routers
  - ios_xe_software 17.3.1
  - ios_xe_software 17.4.1
  - ios_xe_software 17.3.2
  - ios_xe_software 17.2.1r
  - ios_xe_software 17.2.1v
  - ios_xe_software 17.3.3
  - ios_xe_software 17.2.2
  - ios_xe_software 17.3.1a
  - ios_xe_software 17.3.1w
  - ios_xe_software 17.3.2a
  - ios_xe_software 17.4.1a
  - ios_xe_software 17.3.1x
  - ios_xe_software 17.4.1b
  - ios_xe_software 17.3.1z
  - ios_xe_software 17.3.3a
  - ios_xe_software 17.4.1c
  - ios_xe_software 17.11.99SW
published: '2021-10-20'
updated: '2022-02-17'
sourceUpdated: '2022-02-17T18:13:49+00:00'
source: CSAF
sourceUrl: >-
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-rhpbE34A
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-rhpbE34A
  - url: 'https://software.cisco.com'
tags:
  - csaf
  - vendor-advisory
  - cisco
epss: 0.00307
epssPercentile: 0.20897
ingestedAt: '2026-09-25T07:41:37.796Z'
---

## Overview

A vulnerability in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to execute arbitrary commands with root privileges.

The vulnerability is due to insufficient input validation by the system CLI. An attacker could exploit this vulnerability by authenticating to an affected device and submitting crafted input to the system CLI. A successful exploit could allow the attacker to execute commands on the underlying operating system with root privileges.

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

## Vendor advisories

- **cisco-sa-sd-wan-rhpbE34A** · Cisco · affected: Cisco 1000 Series Integrated Services Routers, Cisco ASR 1000 Series Aggregation Services Routers, Cisco 4000 Series Integrated Services Routers, Cisco Integrated Services Virtual Router, Cisco Cloud Services Router 1000V Series, Cisco Catalyst IR1100 Rugged Series Routers, … · updated 2022-02-17 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-rhpbE34A)

**Cisco IOS XE SD-WAN Software Command Injection Vulnerability**. Released 2021-10-20, updated 2022-02-17.

Affected:

- Cisco 1000 Series Integrated Services Routers
- Cisco ASR 1000 Series Aggregation Services Routers
- Cisco 4000 Series Integrated Services Routers
- Cisco Integrated Services Virtual Router
- Cisco Cloud Services Router 1000V Series
- Cisco Catalyst IR1100 Rugged Series Routers
- Cisco IOS XE Software 17.3.1
- Cisco IOS XE Software 17.4.1
- Cisco IOS XE Software 17.3.2
- Cisco IOS XE Software 17.2.1r
- Cisco IOS XE Software 17.2.1v
- Cisco IOS XE Software 17.3.3
- Cisco IOS XE Software 17.2.2
- Cisco IOS XE Software 17.3.1a
- Cisco IOS XE Software 17.3.1w
- Cisco IOS XE Software 17.3.2a
- Cisco IOS XE Software 17.4.1a
- Cisco IOS XE Software 17.3.1x
- Cisco IOS XE Software 17.4.1b
- Cisco IOS XE Software 17.3.1z
- Cisco IOS XE Software 17.3.3a
- Cisco IOS XE Software 17.4.1c
- Cisco IOS XE Software 17.11.99SW

## Remediation

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