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Vulnerabilities

Vulnerability · CVE-2021-20016

SonicWall SSLVPN SMA100 SQL Injection Vulnerability

Published Feb 3, 2021 · catalog updated Aug 11, 2026 · SonicWall SSLVPN SMA100

Patch now

CVE-2021-20016 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm SonicWall SSLVPN SMA100 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
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
40.04%
Remediation
Remediation guidance
Affected products
cpe sonicwall/sma 100 firmware · cpe sonicwall/sma 200 firmware · cpe sonicwall/sma 210 firmware · cpe sonicwall/sma 400 firmware · cpe sonicwall/sma 410 firmware · cpe sonicwall/sma 500v

A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.

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 100 firmwareversion unspecified
  • 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 SSLVPN SMA100version unspecified

How to fix CVE-2021-20016

What to do

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

Should you patch?

CVE-2021-20016 is in the CISA known-exploited catalog, due Nov 17, 2021. Confirm SonicWall SSLVPN SMA100 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 updates per vendor instructions.

What should an analyst verify?

CWE-89: SQL Injection. EPSS 40.04%. 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. Feb 3, 2021 · Catalog

    Detected

    A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Nov 17, 2021 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Aug 11, 2026 · Catalog

    Updated

    A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-20016

    SonicWall SSLVPN SMA100 contains a SQL injection vulnerability that allows remote exploitation for credential access by an unauthenticated attacker.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2021-20016

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-20016

    30-day exploitation probability 40.0%

    first.org
  • NIST NVDVulnerability recordCVE-2021-20016

    A SQL-Injection vulnerability in the SonicWall SSLVPN SMA100 product allows a remote unauthenticated attacker to perform SQL query to access username password and other session related information. This vulnerability impacts SMA100 build version 10.x.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-20016

    SonicWall SSLVPN SMA100 contains a SQL injection vulnerability that allows remote exploitation for credential access by an unauthenticated attacker.

    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.