CVE-2020-5135

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 2022-03-15), 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
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 27%CVSS: 9.8Exploit: NoneExposed: 0

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

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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%
Action: Fix now — active exploitation, automatable, high impact.
EPSS
97.8%
KEV
⚠ Exploited

Published

October 12, 2020

Last Modified

October 31, 2025

Advisory Details (2)

Auto-updated Jun 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-2020-5135
generic

Security Advisory

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2020-0010

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 51× in last 7d / 218× 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 406 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2020-5135?
CVE-2020-5135 is a critical vulnerability published on October 12, 2020. A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7…
When was CVE-2020-5135 disclosed?
CVE-2020-5135 was first published in the National Vulnerability Database on October 12, 2020, 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-2020-5135 actively exploited?
Yes. CISA added CVE-2020-5135 to the Known Exploited Vulnerabilities catalog on March 15, 2022, affecting SonicWall SonicOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-5135?
CVE-2020-5135 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2020-5135?
CVE-2020-5135 affects SonicWall SonicOS. 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-2020-5135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-5135, 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.

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