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.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| SonicWall | SonicWall SMA100 |
|
Timeline
- 3 Feb 2021 Published
- 3 Nov 2021 CVE-2021-20016 added to CISA KEV
- 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).