CVE-2020-11899

CRITICALNVD 5.49.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.4 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 19%CVSS: 5.4Exploit: cisa kev · ssvc active · epss top5pctExposed: 0

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

The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.

CVSS v3
5.4
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 PROB
19%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

June 17, 2020

Last Modified

November 7, 2025

Advisory Details (9)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet. Sources: cert.
cert

VU#257161 - Treck IP stacks contain multiple vulnerabilities

https://www.kb.cert.org/vuls/id/257161/
cert

VU#257161 - Treck IP stacks contain multiple vulnerabilities

https://www.kb.cert.org/vuls/id/257161
generic
https://www.jsof-tech.com/ripple20/
generic

INTEL-SA-00295

https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00295.html
generic

Reaktion von Dell auf die Ripple20-Schwachstellen | Dell Deutschland

https://www.dell.com/support/article/de-de/sln321836/dell-response-to-the-ripple20-vulnerabilities
generic

Multiple Vulnerabilities in Treck IP Stack Affecting Cisco Products: June 2020

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-treck-ip-stack-JyBQ5GyC
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20200625-0006/
generic
https://jsof-tech.com/vulnerability-disclosure-policy/
generic🔴 Active Exploitation

CWE - CWE-125: Out-of-bounds Read (4.20)

https://cwe.mitre.org/data/definitions/125.html

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 60× 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 642 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2020-11899?
CVE-2020-11899 is a critical vulnerability published on June 17, 2020. The Treck TCP/IP stack before 6.0.1.66 has an IPv6 Out-of-bounds Read.
When was CVE-2020-11899 disclosed?
CVE-2020-11899 was first published in the National Vulnerability Database on June 17, 2020, with the most recent update on November 7, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-11899 actively exploited?
Yes. CISA added CVE-2020-11899 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Treck TCP/IP stack IPv6. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2020-11899?
CVE-2020-11899 has a CVSS v3 base score of 5.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2020-11899?
CVE-2020-11899 affects Treck TCP/IP stack IPv6. 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-2020-11899?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-11899, 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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