CVE-2021-20028: SonicWall Secure Remote Access (SRA) SQL Injection Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 28 Mar 2022, 236 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 30.1%
EPSS score, percentile 98.2 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?
Required action (CISA), due 18 Apr 2022: The impacted product is end-of-life and should be disconnected if still in use.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected: 8.x firmware; 9.0.0.9-26sv and earlier.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
The impacted product is end-of-life and should be disconnected if still in use.
CISA due date for this action: 18 April 2022.
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.
| Status | Versions |
|---|---|
| Affected | 8.x firmware |
| Affected | 9.0.0.9-26sv and earlier. |
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
SonicWall Secure Remote Access (SRA) products contain an improper neutralization of a SQL Command leading to SQL injection.
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2021-20028 to its Known Exploited Vulnerabilities (KEV) catalog on 28 Mar 2022.
- CISA marks it as known to be used in ransomware campaigns.
- The due date CISA sets for the required action is 18 Apr 2022.
- The CVE record was published on 4 Aug 2021, 236 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 30.1% (percentile 98.2), 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 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
Description
Improper neutralization of a SQL Command leading to SQL Injection vulnerability impacting end-of-life Secure Remote Access (SRA) products, specifically the SRA appliances running all 8.x firmware and 9.0.0.9-26sv or earlier
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. 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
| Date | Event |
|---|---|
| 4 Aug 2021 | CVE record published |
| 28 Mar 2022 | Added to CISA KEV |
| 18 Apr 2022 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
More exploited SonicWall vulnerabilities
- CVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
- CVE-2026-83549: SonicWall SMA1000 Appliances OS Command Injection Vulnerability
- CVE-2026-15409: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
- CVE-2026-15410: SonicWall SMA1000 Appliances Code Injection Vulnerability
- CVE-2025-40602: SonicWall SMA1000 Missing Authorization Vulnerability
- CVE-2023-44221: SonicWall SMA100 Appliances OS Command Injection Vulnerability