CVE-2021-20028 SonicWall Secure Remote Access (SRA) SQL Injection Vulnerability
SonicWall Secure Remote Access (SRA) products contain an improper neutralization of a SQL Command leading to SQL injection.
From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.
Should You Worry?
- CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 28 Mar 2022.
- CISA lists it as known to be used in ransomware campaigns.
- Rated Critical severity (CVSS 9.8, scored by CISA).
- This product type is often exposed to the internet, which is where attackers scan for it first.
- It has been in the catalogue for 1,684 days. Systems still unpatched now have almost certainly been scanned for it.
What It Is
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
Affected Versions
| Product | Versions |
|---|---|
| SonicWall SonicWall SRA/SMA100 | 8.x firmware 9.0.0.9-26sv and earlier. |
From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.
What To Do Now
- 1
Find it
Search your asset inventory and external attack surface for SonicWall Secure Remote Access (SRA). Include cloud images, appliances and anything a supplier runs for you.
Attack Surface Management - 2
Fix it
The impacted product is end-of-life and should be disconnected if still in use.
Vulnerability Management - 3
Hunt for compromise
If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.
Incident Response - 4
Prove it is fixed
Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.
Penetration Testing
Vendor Advisories
The Compliance Clock
General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.
Not Sure If You Are Exposed?
Our attack surface and vulnerability teams can check your internet-facing estate for CVE-2021-20028 and every other exploited flaw on the list.