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Vulnerabilities

Vulnerability · CVE-2021-20035

SonicWall SMA100 Appliances OS Command Injection Vulnerability

Published Sep 27, 2021 · catalog updated Jun 16, 2026 · SonicWall SMA100 Appliances

Patch now

CVE-2021-20035 is in the CISA known-exploited catalog, due May 7, 2025. Confirm SonicWall SMA100 Appliances against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Medium6.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
4.18%
Remediation
Remediation guidance
Affected products
cpe sonicwall/sma 200 firmware · cpe sonicwall/sma 210 firmware · cpe sonicwall/sma 400 firmware · cpe sonicwall/sma 410 firmware · cpe sonicwall/sma 500v · vendor SonicWall SMA100 Appliances

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe sonicwall/sma 200 firmwareversion unspecified
  • cpe sonicwall/sma 210 firmwareversion unspecified
  • cpe sonicwall/sma 400 firmwareversion unspecified
  • cpe sonicwall/sma 410 firmwareversion unspecified
  • cpe sonicwall/sma 500vversion unspecified
  • vendor SonicWall SMA100 Appliancesversion unspecified

How to fix CVE-2021-20035

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-20035 is in the CISA known-exploited catalog, due May 7, 2025. Confirm SonicWall SMA100 Appliances against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-78: OS Command Injection. EPSS 4.18%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 27, 2021 · Catalog

    Detected

    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.

  2. Apr 16, 2025 · CISA KEV

    Known exploited

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

  3. May 7, 2025 · CISA KEV

    Remediation due

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

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-20035

    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.gov
  • CVE.orgVulnerability recordCVE-2021-20035

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-20035

    30-day exploitation probability 4.2%

    first.org
  • NIST NVDVulnerability recordCVE-2021-20035

    Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user which potentially leads to DoS.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-20035

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.