CVE-2021-20028 (GCVE-0-2021-20028)

Vulnerability from cvelistv5 – Published: 2021-08-04 19:10 – Updated: 2025-10-21 23:25 Unsupported When Assigned
VLAI CISA Shadowserver Previdian
Summary
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
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 14:52 UTC
CWE
  • CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Assigner
sonicwall CNA under the mitre root
CNA scorecard D 54/100 over 34 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
SonicWall SonicWall SRA/SMA100 Affected: 8.x firmware
Affected: 9.0.0.9-26sv and earlier.
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 379199fc-7758-4b6d-ad81-d800954cb401

Vulnerability ID: CVE-2021-20028

Status: Confirmed

Status Updated: 2022-03-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-28
Asserted: 2022-03-28
Scope
Notes: SonicWall Secure Remote Access (SRA) SQL Injection Vulnerability | Affected: SonicWall / Secure Remote Access (SRA) | Description: SonicWall Secure Remote Access (SRA) products contain an improper neutralization of a SQL Command leading to SQL injection. | Required action: The impacted product is end-of-life and should be disconnected if still in use. | Due date: 2022-04-18 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-20028
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-89
Feed CISA Known Exploited Vulnerabilities Catalog
Product Secure Remote Access (SRA)
Due Date 2022-04-18
Date Added 2022-03-28
Vendorproject SonicWall
Vulnerabilityname SonicWall Secure Remote Access (SRA) SQL Injection Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:27 UTC | Updated: 2026-11-04 13:35 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 25dfd85a-a721-4ab3-a6c6-ec9f2d159862

Vulnerability ID: CVE-2021-20028

Status: Confirmed

Status Updated: 2026-11-12 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2024-09-16
Asserted: 2024-09-16
Last Seen: 2026-11-12
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: SonicWall / SonicWall Secure Remote Access | Class: vpn | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-11-12: 8
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 3
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class vpn
7D Avg 1
Vendor SonicWall
30D Avg 1
90D Avg 1
Product SonicWall Secure Remote Access
Cisa Kev yes
Connections 8
Observation Date 2026-11-12
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-11-14 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 53d03fe9-123c-4faa-9c2c-6554b367611d

Vulnerability ID: CVE-2021-20028

Status: Confirmed

Status Updated: 2022-03-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2022-03-28
Asserted: 2022-03-28
Scope
Notes: KEVIntel entry: Improper neutralization of a SQL Command leading to SQL Injection vulnerability impacting end-of-life Secure Remote Access (SRA) products,... | Affected: SonicWall / SonicWall SRA/SMA100 | CVSS: 9.8 (CRITICAL) | EPSS: 0.30084 | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Improper neutralization of a SQL Command leading to SQL Injection vulnerability impacting end-of-life Secure Remote Access (SRA) products,...
Vendor SonicWall
Product SonicWall SRA/SMA100
Added Date 2022-03-28T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.30084
Cvss Severity CRITICAL
Epss Percentile 0.97974
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.