# SonicWall SMA100 Appliances: SMA100 Appliances OS Command Injection Vulnerability · pwn.watch

> 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. Added to CISA KEV on 2025-04-16.

Page: https://pwn.watch/i/sonicwall-sma100-appliances-cve-2021-20035 · generated 2026-10-22T22:41:49.181Z

## Status
- Severity: medium · status: closed · patch: patched
- Product: SonicWall SMA100 Appliances
- Started: 2025-04-16 · closed: 2025-04-16
- CVEs: CVE-2021-20035
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/sonicwall-sma100-appliances-cve-2021-20035/feed.xml
- JSON Feed: https://pwn.watch/i/sonicwall-sma100-appliances-cve-2021-20035/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/sonicwall-sma100-appliances-cve-2021-20035.json
- This file: https://pwn.watch/i/sonicwall-sma100-appliances-cve-2021-20035/llms.txt

## Updates (newest first)
- 2025-04-16: CISA added CVE-2021-20035 to the KEV catalog (due 2025-05-07).

## Fix brief
# Security brief: SonicWall SMA100 Appliances: SMA100 Appliances OS Command Injection Vulnerability

Source: https://pwn.watch/i/sonicwall-sma100-appliances-cve-2021-20035 · status: closed (closed Apr 16, 2025) · severity: medium · updated Apr 16, 2025

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
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. Added to CISA KEV on 2025-04-16.

Severity detail: CVSS 6.5 (CISA ADP, v3.1); actively exploited (CISA KEV)

- Product: SonicWall SMA100 Appliances
- CVE / advisory ids: CVE-2021-20035

## Affected versions
- See vendor advisory / CISA notes (versions not always listed in KEV feed)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- Apr 16, 2025: CISA added CVE-2021-20035 to the KEV catalog (due 2025-05-07).

## Advisories
- [SonicWall advisory: SonicWall SMA100 Appliances](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0022) (SonicWall)
- [NVD: CVE-2021-20035](https://nvd.nist.gov/vuln/detail/CVE-2021-20035) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

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Machine-readable: https://pwn.watch/i/sonicwall-sma100-appliances-cve-2021-20035.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.