CVE-2021-20022

HIGHNVD 7.29.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.2 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
7.2
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 17%CVSS: 7.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.

CVSS v3
7.2
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
96.7%
KEV
⚠ Exploited

Published

April 9, 2021

Last Modified

November 10, 2025

Advisory Details (2)

Auto-updated Jun 11, 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-2021-20022
generic

Security Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0008

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 249× 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 468 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2021-20022?
CVE-2021-20022 is a high vulnerability published on April 9, 2021. SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to upload an arbitrary file to the remote host.
When was CVE-2021-20022 disclosed?
CVE-2021-20022 was first published in the National Vulnerability Database on April 9, 2021, with the most recent update on November 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-20022 actively exploited?
Yes. CISA added CVE-2021-20022 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting SonicWall SonicWall Email Security. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-20022?
CVE-2021-20022 has a CVSS v3 base score of 7.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-20022?
CVE-2021-20022 affects SonicWall SonicWall Email Security. 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-2021-20022?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-20022, 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

Explore the affected products and dependency analysis for CVE-2021-20022

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