VulnTideExploited vulnerabilities, by vendor. Data as of .
Known exploitedIn CISA's KEV catalog since Ransomware use: known
SonicWall SSLVPN SMA100

CVE-2021-20016: SonicWall SSLVPN SMA100 SQL Injection Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 273 days after the CVE record was published.

How likely is exploitation in the next 30 days?
40%

EPSS score, percentile 98.6 of all scored records

How severe?
9.8 Critical

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

CISA deadline . Apply updates per vendor instructions.

The CVE record links no vendor advisory, patch or mitigation.

Which versions are affected?

Affected

  • SMA100 build version 10.x

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

What to do

Required action, set by CISA

Apply updates per vendor instructions.

CISA due date for this action: .

Advisories and patches

The CVE record links no vendor advisory, patch or mitigation.

Linked from CISA's catalog entry

Affected products and versions

As listed in the CVE record.

SonicWall SonicWall SMA100
StatusVersions
AffectedSMA100 build version 10.x

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

About this vulnerability

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

Summary: CISA's KEV catalog, as of .

  • CISA added CVE-2021-20016 to its Known Exploited Vulnerabilities (KEV) catalog on 3 Nov 2021.
  • CISA marks it as known to be used in ransomware campaigns.
  • The due date CISA sets for the required action is 17 Nov 2021.
  • The CVE record was published on 3 Feb 2021, 273 days before it was added to KEV.
  • The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), taken from CISA's enrichment of the record.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 40% (percentile 98.6), as of 28 Oct 2026.
  • CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.

Description

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.

Weakness

  • CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

DateEvent
CVE record published
Added to CISA KEV
CISA due date for the required action
CVE record last updated

References

More exploited SonicWall vulnerabilities

  • CVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability (added )
  • CVE-2026-83549: SonicWall SMA1000 Appliances OS Command Injection Vulnerability (added )
  • CVE-2026-15409: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability (added )
  • CVE-2026-15410: SonicWall SMA1000 Appliances Code Injection Vulnerability (added )
  • CVE-2025-40602: SonicWall SMA1000 Missing Authorization Vulnerability (added )
  • CVE-2023-44221: SonicWall SMA100 Appliances OS Command Injection Vulnerability (added )