CVE-2021-20028

CRITICALNVD 9.89.8—Trending — 4 sources updated this weekExploited in the wild

9.8

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

CVSS v3: 9.8
EG Score: 9.8(high)
EPSS: 99.1%
KEV: ⚠ Exploited

Published

August 4, 2021

Last Modified

October 31, 2025

Advisory Details (2)

Auto-updated May 26, 2026

⚠️ Active exploitation confirmed. Patch available. Sources: cisa.

cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20028

generic

Security Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0017

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-89SQL Injection

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-10 07:45 UTCEG score recompute
2026-06-10 07:45 UTCGHSA enrichment
2026-06-10 03:58 UTCEG score recompute
2026-06-10 03:58 UTCGHSA enrichment
2026-06-10 00:11 UTCEG score recompute
2026-06-10 00:11 UTCGHSA enrichment
2026-06-09 20:24 UTCEG score recompute
2026-06-09 20:23 UTCGHSA enrichment
2026-06-09 18:42 UTCCISA KEV update
2026-06-09 17:12 UTCCISA KEV update
2026-06-09 16:35 UTCEG score recompute
2026-06-09 16:35 UTCGHSA enrichment
2026-06-09 12:48 UTCEG score recompute
2026-06-09 12:48 UTCGHSA enrichment
2026-06-09 09:01 UTCEG score recompute
2026-06-09 09:00 UTCGHSA enrichment
2026-06-09 05:14 UTCEG score recompute
2026-06-09 05:14 UTCGHSA enrichment
2026-06-09 01:27 UTCEG score recompute
2026-06-09 01:26 UTCGHSA enrichment

Frequently asked(6)

What is CVE-2021-20028?

CVE-2021-20028 is a critical vulnerability published on August 4, 2021. 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

When was CVE-2021-20028 disclosed?

CVE-2021-20028 was first published in the National Vulnerability Database on August 4, 2021, with the most recent update on October 31, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-20028 actively exploited?

Yes. CISA added CVE-2021-20028 to the Known Exploited Vulnerabilities catalog on March 28, 2022, affecting SonicWall Secure Remote Access (SRA). KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.

What is the CVSS score of CVE-2021-20028?

CVE-2021-20028 has a CVSS v3 base score of 9.8 (NVD).

Which products are affected by CVE-2021-20028?

CVE-2021-20028 affects SonicWall Secure Remote Access (SRA). The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.

How do I remediate CVE-2021-20028?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20028, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-20028

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Is Your Infrastructure Affected by CVE-2021-20028?

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CVE-2021-20028

📅 Published

🔄 Last Modified

📋 Advisory Details (2)