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Vulnerabilities/CVE-2021-20028Public Intelligence Dossier
Source: sonicwall · Limited verification•Last verified: •Collection Degraded
CVE-2021-20028ListedCRITICAL (raw)CVSS 9.8CWE-89

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

Published: 05 Aug 2021•Last updated: 17 Jun 2026, 09:03 AM IST•Source identifier: PSIRT@sonicwall.com
Dossier completeness: source-provided sections 3 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Listed
Added28 Mar 2022
Due18 Apr 2022
RansomwareKnown
CVSS score
9.8CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
30.1%0.301
Percentile98th
Weakness type
CWE-89
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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

SOC priority

Immediate Attention

Actively exploited (source statement)

Yes

Publicly disclosed

Unknown

Risk basis: CISA KEV exploitation signal; CRITICAL severity; Source-confirmed exploitation or CISA KEV/ransomware metadata

Affected Products & Remediation

6 source-backed products
Affected products and versions (source)
  • sonicwall sma 210 firmware · >= 8.0.0.0 < 9.0.0.10-28sv · NVD CPE · Source
  • sonicwall sma 410 firmware · >= 8.0.0.0 < 9.0.0.10-28sv · NVD CPE · Source
  • sonicwall sma 500v firmware · >= 8.0.0.0 < 9.0.0.10-28sv · NVD CPE · Source
  • sonicwall sra 4600 firmware · >= 8.0.0.0 < 9.0.0.10-28sv · NVD CPE · Source
  • sonicwall sra 1600 firmware · >= 8.0.0.0 < 9.0.0.10-28sv · NVD CPE · Source
  • sonicwall sra va firmware · >= 8.0.0.0 < 9.0.0.10-28sv · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sma_500v:-:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sra_4600:-:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sra_1600:-:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sra_va:-:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

  • CISA KEV: The impacted product is end-of-life and should be disconnected if still in use.

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Listed
Exploited (source statement)
Yes
Publicly disclosed (source)
Unknown

CISA required action: The impacted product is end-of-life and should be disconnected if still in use.

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched kev-network-exposure (CVSS AV:N, CISA KEV Listed); sql-injection (CWE-89)

Exposure

  1. Identify assets with the exact CVE and confirm the affected product/version against the advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · KEV listing raises urgency, but inventory is needed to establish local exposure. · Rule kev-network-exposure
  2. Locate the affected application endpoint and confirm its deployed version.Telemetry: Application access logs · The CWE describes a weakness class, not which local endpoint is affected. · Rule sql-injection

Exploitation evidence

  1. Review relevant edge or application access logs for unusual requests around the advisory window.Telemetry: CommonSecurityLog · Log review is a hunting hypothesis; KEV listing alone does not show local exploitation. · Rule kev-network-exposure
Show more (2)

Exploitation evidence

  1. Review requests to the affected endpoint for unusual query syntax and response anomalies.Telemetry: Application access logs · Request and error patterns can guide an SQL injection investigation. · Rule sql-injection

Response

  1. Recheck the affected assets after the source-stated mitigation or update is applied.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies local remediation. · Rule kev-network-exposure

CISA KEV Record

Catalog entry
28 Mar 2022
Required action due
18 Apr 2022
Known ransomware use
Known

The impacted product is end-of-life and should be disconnected if still in use.

Change History & Source Data

— No recorded material change

CNA / source
PSIRT@sonicwall.com
Record status · verification
UPDATED · CISA KEV confirmed
CPE
cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:*, cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:*, cpe:2.3:o:sonicwall:sma_500v_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sma_500v:-:*:*:*:*:*:*:*, cpe:2.3:o:sonicwall:sra_4600_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sra_4600:-:*:*:*:*:*:*:*, cpe:2.3:o:sonicwall:sra_1600_firmware:*:*:*:*:*:*:*:*, cpe:2.3:h:sonicwall:sra_1600:-:*:*:*:*:*:*:*

Evidence & Provenance

4 public sources
CISA KEV CatalogAdded 2022-03-28psirt.global.sonicwall.comSource recordnvd.nist.govSource recordcisa.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2021-20028
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2021-20028
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2021-20028"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.