How severe is CVE-2021-20028?

CVE-2021-20028 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20028 being actively exploited?

Yes. CVE-2021-20028 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-28, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-20028?

CVE-2021-20028 primarily affects Sonicwall Sma 210 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20028?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-20028 have an EU (EUVD) identifier?

Yes. CVE-2021-20028 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-7491. It is also flagged as exploited in the EUVD (since 2022-03-28).

When was CVE-2021-20028 published?

CVE-2021-20028 was published on 2021-08-04 and last updated on 2026-06-17.

CVE-2021-20028

CVE-2021-20028 is a critical-severity vulnerability in Sonicwall Sma 210 Firmware with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-28). The underlying weakness is classified as CWE-89.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 30% (98th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-03-28)
EU (EUVD) id: EUVD-2021-7491
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-28)
Weakness: CWE-89
Affected product: Sonicwall Sma 210 Firmware
Published: 2021-08-04
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2021-20028?: 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
How severe is CVE-2021-20028?: CVE-2021-20028 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20028 being actively exploited?: Yes. CVE-2021-20028 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-28, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2021-20028?: CVE-2021-20028 primarily affects Sonicwall Sma 210 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20028?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2021-20028 have an EU (EUVD) identifier?: Yes. CVE-2021-20028 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-7491. It is also flagged as exploited in the EUVD (since 2022-03-28).
When was CVE-2021-20028 published?: CVE-2021-20028 was published on 2021-08-04 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sma_500v_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sra_4600_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sra_1600_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:sonicwall:sra_va_firmware:*:*:*:*:*:*:*:*

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