---
id: "CVE-2021-20035"
kind: "vulnerability"
aliases: ["CVE-2021-20035"]
title: "Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated\u2026"
severity: "high"
cvss: 6.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "SonicWall SMA100 Appliances", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "sonicwall sma 200 firmware", "fixed": ["9.0.0.11-31sv"], "affected": "< 9.0.0.11-31sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 200 firmware", "fixed": ["10.2.0.8-37sv"], "affected": ">= 10.2.0.0, < 10.2.0.8-37sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 200 firmware", "fixed": ["10.2.1.1-19sv"], "affected": ">= 10.2.1.0, < 10.2.1.1-19sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 210 firmware", "fixed": ["9.0.0.11-31sv"], "affected": "< 9.0.0.11-31sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 210 firmware", "fixed": ["10.2.0.8-37sv"], "affected": ">= 10.2.0.0, < 10.2.0.8-37sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 210 firmware", "fixed": ["10.2.1.1-19sv"], "affected": ">= 10.2.1.0, < 10.2.1.1-19sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 400 firmware", "fixed": ["9.0.0.11-31sv"], "affected": "< 9.0.0.11-31sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 400 firmware", "fixed": ["10.2.0.8-37sv"], "affected": ">= 10.2.0.0, < 10.2.0.8-37sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 400 firmware", "fixed": ["10.2.1.1-19sv"], "affected": ">= 10.2.1.0, < 10.2.1.1-19sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 410 firmware", "fixed": ["9.0.0.11-31sv"], "affected": "< 9.0.0.11-31sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 410 firmware", "fixed": ["10.2.0.8-37sv"], "affected": ">= 10.2.0.0, < 10.2.0.8-37sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 410 firmware", "fixed": ["10.2.1.1-19sv"], "affected": ">= 10.2.1.0, < 10.2.1.1-19sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 500v", "fixed": ["9.0.0.11-31sv"], "affected": "< 9.0.0.11-31sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 500v", "fixed": ["10.2.0.8-37sv"], "affected": ">= 10.2.0.0, < 10.2.0.8-37sv", "ecosystem": "vendor"}, {"name": "sonicwall sma 500v", "fixed": ["10.2.1.1-19sv"], "affected": ">= 10.2.1.0, < 10.2.1.1-19sv", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "self-hosted", "sma100", "sonicwall"]
not_affected_if: ["management-interface-restricted", "no-sma100-appliance"]
published_at: "2021-09-27T18:15:08+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T22:29:05+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20035", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20035", "first_seen_at": "2026-10-23T22:29:05+00:00"}]
---

# Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated…

SonicWall SMA100 appliances have an OS command injection flaw in the management interface. A remote attacker with a valid login can run arbitrary commands on the appliance as the 'nobody' user, which can lead to code execution.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:SonicWall SMA100 Appliances affected ? fixed ?
- vendor:sonicwall sma 200 firmware affected < 9.0.0.11-31sv fixed 9.0.0.11-31sv
- vendor:sonicwall sma 200 firmware affected >= 10.2.0.0, < 10.2.0.8-37sv fixed 10.2.0.8-37sv
- vendor:sonicwall sma 200 firmware affected >= 10.2.1.0, < 10.2.1.1-19sv fixed 10.2.1.1-19sv
- vendor:sonicwall sma 210 firmware affected < 9.0.0.11-31sv fixed 9.0.0.11-31sv
- vendor:sonicwall sma 210 firmware affected >= 10.2.0.0, < 10.2.0.8-37sv fixed 10.2.0.8-37sv
- vendor:sonicwall sma 210 firmware affected >= 10.2.1.0, < 10.2.1.1-19sv fixed 10.2.1.1-19sv
- vendor:sonicwall sma 400 firmware affected < 9.0.0.11-31sv fixed 9.0.0.11-31sv
- vendor:sonicwall sma 400 firmware affected >= 10.2.0.0, < 10.2.0.8-37sv fixed 10.2.0.8-37sv
- vendor:sonicwall sma 400 firmware affected >= 10.2.1.0, < 10.2.1.1-19sv fixed 10.2.1.1-19sv
- vendor:sonicwall sma 410 firmware affected < 9.0.0.11-31sv fixed 9.0.0.11-31sv
- vendor:sonicwall sma 410 firmware affected >= 10.2.0.0, < 10.2.0.8-37sv fixed 10.2.0.8-37sv
- vendor:sonicwall sma 410 firmware affected >= 10.2.1.0, < 10.2.1.1-19sv fixed 10.2.1.1-19sv
- vendor:sonicwall sma 500v affected < 9.0.0.11-31sv fixed 9.0.0.11-31sv
- vendor:sonicwall sma 500v affected >= 10.2.0.0, < 10.2.0.8-37sv fixed 10.2.0.8-37sv
- vendor:sonicwall sma 500v affected >= 10.2.1.0, < 10.2.1.1-19sv fixed 10.2.1.1-19sv

## Fix

Apply the mitigations in the vendor advisory per CISA instructions; if none are available, discontinue use of the appliance. Specific fixed firmware versions: unknown

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-20035
- 2026-10-23T22:29:05+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2021-20035

## From the sources

SonicWall SMA100 appliances contain an OS command injection vulnerability in the management interface that allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user, which could potentially lead to code execution.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_