CVE-2021-20028

Name: CVE-2021-20028
Creator: NVD / NIST
Published: 2021-08-04T19:15:08.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 30.08%

Last modified Jun 17, 2026

CVE-2021-20028 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 30.08% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

30.08%

98.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Apr 18, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sonicwall	Sma 210 Firmware	>= 8.0.0.0, < 9.0.0.10-28sv
Sonicwall	Sma 410 Firmware	>= 8.0.0.0, < 9.0.0.10-28sv
Sonicwall	Sma 500v Firmware	>= 8.0.0.0, < 9.0.0.10-28sv
Sonicwall	Sra 4600 Firmware	>= 8.0.0.0, < 9.0.0.10-28sv
Sonicwall	Sra 1600 Firmware	>= 8.0.0.0, < 9.0.0.10-28sv
Sonicwall	Sra Va Firmware	>= 8.0.0.0, < 9.0.0.10-28sv

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0017Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0017Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20028US Government Resource

Timeline

Published: Aug 4, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-20028?

How severe is CVE-2021-20028?

CVE-2021-20028 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 30.08% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-20028?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20028?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST