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
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 27%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomware · epss top5pctExposed: 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 PROB
27%
EPSS %ILE
98%
KEV
⚠ Exploited

Published

October 12, 2020

Last Modified

October 31, 2025

Advisory Details (2)

Auto-updated Sep 17, 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 53× in last 7d / 225× 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 833 total refreshes for this CVE.

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

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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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