CVE-2021-20028 — Sma 210 Firmware
CRITICALCVE-2021-20028 is a critical-severity (CVSS 9.8) SQL Injection vulnerability in sonicwall sma 210 firmware. It is in CISA's Known Exploited Vulnerabilities catalog (added 2022-03-28) and has been used in ransomware campaigns — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.
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…
Exploitation Status
Actively exploited in the wild
- Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2022-03-28 — including use in ransomware campaigns. Federal agencies were required to remediate by 2022-04-18.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2021-20028.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-20028 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 395,249 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.
Description
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 Products
sma 210 firmwaresonicwallsma 410 firmwaresonicwallsma 500v firmwaresonicwallsra 1600 firmwaresonicwallsra 4600 firmwaresonicwallsra va firmwaresonicwallResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Vendor / applianceDetect
Inventory every sonicwall sma 210 firmware deployment and check each version against the affected-products list above.
Fix
Apply the sonicwall sma 210 firmware security patch or hotfix for CVE-2021-20028 on the affected version, following the vendor advisory for your exact build.
Workarounds
Until you can upgrade, make sure every query built from user input uses parameterised statements or a prepared-statement API rather than string concatenation, and reduce the database account's privileges so an injected query cannot read or alter data beyond what the feature needs. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2021-20028 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.