Exploited CVEs / SonicWall / CVE-2021-20028
CVE-2021-20028
SonicWall Secure Remote Access (SRA) SQL Injection Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2022-04-18 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: SonicWall PSIRT Advisories, linked below.
Actively exploited SonicWall Secure Remote Access (SRA) vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2022-03-28.
Risk summary
Updated July 25, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2021-20028
SonicWall's legacy Secure Remote Access appliances carry a Critical (CVSS 9.8) SQL injection that ransomware groups have exploited to break in through the very device meant to guard remote access. These SRA boxes are older products that many organizations forgot at the network edge. A compromised remote access appliance hands attackers valid paths into the internal network.
Do this: Locate any SonicWall SRA appliance still in service and decommission or patch it before the end of the day.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2021-20028
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2021-20028
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2022-04-18 (past due).
The impacted product is end-of-life and should be disconnected if still in use.
Official fix for CVE-2021-20028
The authoritative fix and affected-version list are published by the vendor. Find the Secure Remote Access (SRA) advisory on SonicWall PSIRT Advisories.
Common questions about CVE-2021-20028
Is CVE-2021-20028 actively exploited?
Yes. CVE-2021-20028 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-03-28, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 30%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2021-20028?
CISA set the federal (BOD 22-01) remediation due date at 2022-04-18, which has passed; treat any unremediated system as overdue. The verbatim required action: The impacted product is end-of-life and should be disconnected if still in use.
What fixes CVE-2021-20028?
The authoritative fix is in the vendor advisory: see SonicWall PSIRT Advisories for the patched Secure Remote Access (SRA) versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2021-20028?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2021-20028's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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All SonicWall exploited CVEs on one page: SonicWall vulnerabilities actively exploited.
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
