CVE-2021-20028Known exploitationNetwork attack vector

Unauthenticated data access via SQL injection

Published Aug 4, 2021 · Updated Oct 21, 2025

SQL injection in SonicWall Secure Mobile Access 100 Series 8.x and 9.0.0.9-26sv and earlier allows remote attackers to access appliance data. SonicWall identifies improper SQL-command neutralization but does not disclose the affected request handler, parameter, or database query. No authentication or user interaction is required; successful exploitation can read or alter data and interrupt the appliance service.

CVSS severity9.8
Critical
EPSS probability30.08%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in SonicWall Secure Mobile Access 100 Series 8.x and 9.0.0.9-26sv and earlier allows remote attackers to access appliance data. SonicWall identifies improper SQL-command neutralization but does not disclose the affected request handler, parameter, or database query. No authentication or user interaction is required; successful exploitation can read or alter data and interrupt the appliance service.

The record

CVE
CVE-2021-20028
Published
Aug 4, 2021
Updated
Oct 21, 2025
Vendor
SonicWall
Product
Secure Mobile Access 100 Series
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Mar 28, 2022Exploitation reportedCISA Known Exploited Vulnerabilities Catalog listing
  3. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.x firmware
  2. Affected versionversion=9.0.0.9-26sv and earlier.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SonicWall · Secure Mobile Access 100 Seriesversion=8.x firmware; version=9.0.0.9-26sv and earlier.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 16, 2026. Gaps indicate unavailable data.
Sep 10, 2026Sep 16, 2026
View daily counts
Reporting dayUnique IPs
Sep 10, 20268
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 20261
Sep 14, 20262
Sep 15, 20261
Sep 16, 20262
Latest reporting daySep 16, 2026
Latest daily unique IPs2
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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