CVE-2021-20016

SonicWall SSLVPN SMA100 SQL Injection Vulnerability

  • Critical 9.8
  • Exploited: added to CISA KEV 3 Nov 2021
  • Used in ransomware campaigns

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.

Key facts

Published
3 Feb 2021
Last changed
12 Aug 2026
Assigned by
sonicwall
KEV added
3 Nov 2021
KEV fix due
17 Nov 2021
Used in ransomware
Yes, according to CISA
EPSS
40.038% likely to be exploited in the next 30 days, higher than 98.654% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
SonicWallSonicWall SMA100
  • SMA100 build version 10.x (affected)

Timeline

  1. 3 Feb 2021 Published
  2. 3 Nov 2021 CVE-2021-20016 added to CISA KEV
  3. 3 Nov 2021 Added to the CISA KEV catalogue

Weakness

Practice this bug class

HackZoneLabs has a hands-on lab on SQL injection (CWE-89).

References