CVE-2021-20016Known exploitationNetwork attack vector

Credential and session-data disclosure via SQL injection

Published Feb 3, 2021 · Updated Aug 12, 2026

SQL injection in SonicWall Secure Mobile Access 100 Series firmware 10.x allows remote attackers to read credentials and session data. The affected request handler and query are undisclosed; the appliance fails to neutralize attacker-controlled SQL before executing a database query. No authentication or user interaction is required, and the disclosed data can enable unauthorized access to the appliance.

CVSS severity9.8
Critical
EPSS probability40.04%
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 firmware 10.x allows remote attackers to read credentials and session data. The affected request handler and query are undisclosed; the appliance fails to neutralize attacker-controlled SQL before executing a database query. No authentication or user interaction is required, and the disclosed data can enable unauthorized access to the appliance.

The record

CVE
CVE-2021-20016
Published
Feb 3, 2021
Updated
Aug 12, 2026
Vendor
SonicWall
Product
Secure Mobile Access (SMA) 100 Series
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2021Exploitation reportedCISA Known Exploited Vulnerabilities listing
  3. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=SMA100 build version 10.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SonicWall · Secure Mobile Access (SMA) 100 Seriesversion=SMA100 build version 10.x

Published CVSS scores

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 IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
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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