CVE-2021-20028

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-28), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 30%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomware · epss top5pctExposed services: Not assessed

A fix is available — apply it.

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
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
30%
EPSS %ILE
98th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 4, 2021

Last Modified

October 31, 2025

Advisory Details (2)

Auto-updated Oct 1, 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.

Data Freshness Timeline

(refreshed 57× in last 7d / 258× 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.

Showing the most recent 100 of 1,049 total refreshes for this CVE.

  1. 2026-10-04 15:40 UTCGHSA enrichment
  2. 2026-10-04 11:52 UTCGHSA enrichment
  3. 2026-10-04 08:05 UTCGHSA enrichment
  4. 2026-10-04 04:17 UTCGHSA enrichment
  5. 2026-10-04 00:30 UTCGHSA enrichment
  6. 2026-10-03 20:43 UTCGHSA enrichment
  7. 2026-10-03 16:53 UTCEG score recompute
  8. 2026-10-03 16:53 UTCGHSA enrichment
  9. 2026-10-03 14:22 UTCEPSS rescore
  10. 2026-10-03 14:22 UTCEPSS rescore
  11. 2026-10-03 13:06 UTCGHSA enrichment
  12. 2026-10-03 09:18 UTCGHSA enrichment
  13. 2026-10-03 05:30 UTCGHSA enrichment
  14. 2026-10-03 01:43 UTCGHSA enrichment
  15. 2026-10-02 21:56 UTCGHSA enrichment
  16. 2026-10-02 18:09 UTCEG score recompute
  17. 2026-10-02 18:08 UTCGHSA enrichment
  18. 2026-10-02 16:22 UTCEPSS rescore
  19. 2026-10-02 14:19 UTCGHSA enrichment
  20. 2026-10-02 10:28 UTCGHSA enrichment
  21. 2026-10-02 06:41 UTCGHSA enrichment
  22. 2026-10-02 02:53 UTCGHSA enrichment
  23. 2026-10-01 23:03 UTCEG score recompute
  24. 2026-10-01 23:03 UTCGHSA enrichment
  25. 2026-10-01 19:46 UTCEPSS rescore
Show 75 more
  1. 2026-10-01 19:15 UTCGHSA enrichment
  2. 2026-10-01 15:26 UTCGHSA enrichment
  3. 2026-10-01 11:38 UTCGHSA enrichment
  4. 2026-10-01 07:49 UTCGHSA enrichment
  5. 2026-10-01 04:01 UTCGHSA enrichment
  6. 2026-10-01 00:14 UTCGHSA enrichment
  7. 2026-09-30 20:27 UTCGHSA enrichment
  8. 2026-09-30 16:39 UTCEG score recompute
  9. 2026-09-30 16:39 UTCGHSA enrichment
  10. 2026-09-30 15:00 UTCEPSS rescore
  11. 2026-09-30 12:51 UTCGHSA enrichment
  12. 2026-09-30 09:03 UTCGHSA enrichment
  13. 2026-09-30 05:15 UTCGHSA enrichment
  14. 2026-09-30 01:26 UTCGHSA enrichment
  15. 2026-09-29 21:38 UTCGHSA enrichment
  16. 2026-09-29 17:47 UTCGHSA enrichment
  17. 2026-09-29 13:56 UTCGHSA enrichment
  18. 2026-09-29 10:08 UTCGHSA enrichment
  19. 2026-09-29 06:20 UTCGHSA enrichment
  20. 2026-09-29 02:33 UTCGHSA enrichment
  21. 2026-09-28 22:45 UTCEG score recompute
  22. 2026-09-28 22:45 UTCGHSA enrichment
  23. 2026-09-28 18:58 UTCGHSA enrichment
  24. 2026-09-28 15:11 UTCEG score recompute
  25. 2026-09-28 15:11 UTCGHSA enrichment
  26. 2026-09-28 13:47 UTCEPSS rescore
  27. 2026-09-28 11:23 UTCGHSA enrichment
  28. 2026-09-28 07:35 UTCGHSA enrichment
  29. 2026-09-28 03:48 UTCGHSA enrichment
  30. 2026-09-28 00:00 UTCGHSA enrichment
  31. 2026-09-27 21:51 UTCCISA KEV update
  32. 2026-09-27 20:12 UTCGHSA enrichment
  33. 2026-09-27 16:24 UTCEG score recompute
  34. 2026-09-27 16:24 UTCGHSA enrichment
  35. 2026-09-27 13:41 UTCEPSS rescore
  36. 2026-09-27 12:37 UTCGHSA enrichment
  37. 2026-09-27 08:49 UTCGHSA enrichment
  38. 2026-09-27 05:02 UTCGHSA enrichment
  39. 2026-09-27 01:15 UTCGHSA enrichment
  40. 2026-09-26 21:26 UTCGHSA enrichment
  41. 2026-09-26 17:39 UTCEG score recompute
  42. 2026-09-26 17:38 UTCGHSA enrichment
  43. 2026-09-26 15:54 UTCEPSS rescore
  44. 2026-09-26 15:54 UTCEPSS rescore
  45. 2026-09-26 13:48 UTCGHSA enrichment
  46. 2026-09-26 10:00 UTCGHSA enrichment
  47. 2026-09-26 06:10 UTCGHSA enrichment
  48. 2026-09-26 02:21 UTCGHSA enrichment
  49. 2026-09-25 22:33 UTCGHSA enrichment
  50. 2026-09-25 19:35 UTCCISA KEV update
  51. 2026-09-25 18:44 UTCGHSA enrichment
  52. 2026-09-25 14:56 UTCGHSA enrichment
  53. 2026-09-25 14:55 UTCCISA KEV update
  54. 2026-09-25 11:08 UTCGHSA enrichment
  55. 2026-09-25 07:21 UTCGHSA enrichment
  56. 2026-09-25 03:33 UTCGHSA enrichment
  57. 2026-09-24 23:46 UTCGHSA enrichment
  58. 2026-09-24 19:59 UTCGHSA enrichment
  59. 2026-09-24 19:31 UTCCISA KEV update
  60. 2026-09-24 16:12 UTCEG score recompute
  61. 2026-09-24 16:12 UTCGHSA enrichment
  62. 2026-09-24 14:00 UTCEPSS rescore
  63. 2026-09-24 14:00 UTCEPSS rescore
  64. 2026-09-24 12:25 UTCGHSA enrichment
  65. 2026-09-24 08:37 UTCGHSA enrichment
  66. 2026-09-24 04:49 UTCGHSA enrichment
  67. 2026-09-24 01:01 UTCGHSA enrichment
  68. 2026-09-23 21:14 UTCGHSA enrichment
  69. 2026-09-23 17:27 UTCEG score recompute
  70. 2026-09-23 17:27 UTCGHSA enrichment
  71. 2026-09-23 13:44 UTCEPSS rescore
  72. 2026-09-23 13:39 UTCGHSA enrichment
  73. 2026-09-23 09:52 UTCGHSA enrichment
  74. 2026-09-23 06:05 UTCGHSA enrichment
  75. 2026-09-23 02:18 UTCGHSA enrichment

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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 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 attention. A fix is available. Apply it.
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).
How do I remediate CVE-2021-20028?
A fix for CVE-2021-20028 is available: update to the fixed version the vendor names in its advisory.

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