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 — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 18%CVSS: 5.4Exploit: cisa kev · ssvc active · epss top5pctExposed services: Not assessed

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

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

CVSS v3
5.4
EG Score
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA 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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
18%
EPSS %ILE
97th
KEV
⚠ Exploited

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

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 48× in last 7d / 236× 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 998 total refreshes for this CVE.

  1. 2026-10-05 17:25 UTCGHSA enrichment
  2. 2026-10-05 13:17 UTCGHSA enrichment
  3. 2026-10-05 09:09 UTCGHSA enrichment
  4. 2026-10-05 04:58 UTCGHSA enrichment
  5. 2026-10-05 00:49 UTCGHSA enrichment
  6. 2026-10-04 20:39 UTCGHSA enrichment
  7. 2026-10-04 16:31 UTCGHSA enrichment
  8. 2026-10-04 12:23 UTCGHSA enrichment
  9. 2026-10-04 08:15 UTCGHSA enrichment
  10. 2026-10-04 04:07 UTCGHSA enrichment
  11. 2026-10-03 23:59 UTCGHSA enrichment
  12. 2026-10-03 19:49 UTCGHSA enrichment
  13. 2026-10-03 15:41 UTCEG score recompute
  14. 2026-10-03 15:41 UTCGHSA enrichment
  15. 2026-10-03 14:22 UTCEPSS rescore
  16. 2026-10-03 11:31 UTCGHSA enrichment
  17. 2026-10-03 07:23 UTCGHSA enrichment
  18. 2026-10-03 03:15 UTCGHSA enrichment
  19. 2026-10-02 23:06 UTCGHSA enrichment
  20. 2026-10-02 18:55 UTCEG score recompute
  21. 2026-10-02 18:55 UTCGHSA enrichment
  22. 2026-10-02 14:47 UTCGHSA enrichment
  23. 2026-10-02 10:39 UTCGHSA enrichment
  24. 2026-10-02 06:25 UTCGHSA enrichment
  25. 2026-10-02 02:17 UTCGHSA enrichment
Show 75 more
  1. 2026-10-01 22:08 UTCEG score recompute
  2. 2026-10-01 22:08 UTCGHSA enrichment
  3. 2026-10-01 17:59 UTCGHSA enrichment
  4. 2026-10-01 13:49 UTCGHSA enrichment
  5. 2026-10-01 09:41 UTCGHSA enrichment
  6. 2026-10-01 05:33 UTCGHSA enrichment
  7. 2026-10-01 01:25 UTCGHSA enrichment
  8. 2026-09-30 21:18 UTCGHSA enrichment
  9. 2026-09-30 17:09 UTCEG score recompute
  10. 2026-09-30 17:09 UTCGHSA enrichment
  11. 2026-09-30 14:59 UTCEPSS rescore
  12. 2026-09-30 13:01 UTCGHSA enrichment
  13. 2026-09-30 08:52 UTCGHSA enrichment
  14. 2026-09-30 04:44 UTCGHSA enrichment
  15. 2026-09-30 00:36 UTCGHSA enrichment
  16. 2026-09-29 20:27 UTCGHSA enrichment
  17. 2026-09-29 16:19 UTCEG score recompute
  18. 2026-09-29 16:18 UTCGHSA enrichment
  19. 2026-09-29 12:10 UTCGHSA enrichment
  20. 2026-09-29 08:01 UTCGHSA enrichment
  21. 2026-09-29 03:54 UTCGHSA enrichment
  22. 2026-09-28 23:46 UTCEG score recompute
  23. 2026-09-28 23:45 UTCGHSA enrichment
  24. 2026-09-28 19:37 UTCGHSA enrichment
  25. 2026-09-28 15:27 UTCEG score recompute
  26. 2026-09-28 15:27 UTCGHSA enrichment
  27. 2026-09-28 11:19 UTCGHSA enrichment
  28. 2026-09-28 07:11 UTCGHSA enrichment
  29. 2026-09-28 03:03 UTCGHSA enrichment
  30. 2026-09-27 22:55 UTCGHSA enrichment
  31. 2026-09-27 21:51 UTCCISA KEV update
  32. 2026-09-27 18:47 UTCGHSA enrichment
  33. 2026-09-27 14:38 UTCEG score recompute
  34. 2026-09-27 14:38 UTCGHSA enrichment
  35. 2026-09-27 13:40 UTCEPSS rescore
  36. 2026-09-27 10:29 UTCGHSA enrichment
  37. 2026-09-27 06:20 UTCGHSA enrichment
  38. 2026-09-27 02:11 UTCGHSA enrichment
  39. 2026-09-26 22:03 UTCGHSA enrichment
  40. 2026-09-26 17:55 UTCEG score recompute
  41. 2026-09-26 17:54 UTCGHSA enrichment
  42. 2026-09-26 15:54 UTCEPSS rescore
  43. 2026-09-26 13:46 UTCGHSA enrichment
  44. 2026-09-26 09:27 UTCGHSA enrichment
  45. 2026-09-26 05:18 UTCGHSA enrichment
  46. 2026-09-26 01:08 UTCEG score recompute
  47. 2026-09-26 01:08 UTCGHSA enrichment
  48. 2026-09-26 00:20 UTCEPSS rescore
  49. 2026-09-25 20:56 UTCGHSA enrichment
  50. 2026-09-25 19:35 UTCCISA KEV update
  51. 2026-09-25 16:48 UTCGHSA enrichment
  52. 2026-09-25 14:55 UTCCISA KEV update
  53. 2026-09-25 12:40 UTCGHSA enrichment
  54. 2026-09-25 08:32 UTCGHSA enrichment
  55. 2026-09-25 04:24 UTCGHSA enrichment
  56. 2026-09-25 00:16 UTCGHSA enrichment
  57. 2026-09-24 20:08 UTCGHSA enrichment
  58. 2026-09-24 19:31 UTCCISA KEV update
  59. 2026-09-24 16:00 UTCEG score recompute
  60. 2026-09-24 16:00 UTCGHSA enrichment
  61. 2026-09-24 13:59 UTCEPSS rescore
  62. 2026-09-24 11:52 UTCGHSA enrichment
  63. 2026-09-24 07:44 UTCGHSA enrichment
  64. 2026-09-24 03:37 UTCGHSA enrichment
  65. 2026-09-23 23:28 UTCGHSA enrichment
  66. 2026-09-23 19:20 UTCGHSA enrichment
  67. 2026-09-23 15:12 UTCEG score recompute
  68. 2026-09-23 15:12 UTCGHSA enrichment
  69. 2026-09-23 11:04 UTCGHSA enrichment
  70. 2026-09-23 06:56 UTCGHSA enrichment
  71. 2026-09-23 02:48 UTCGHSA enrichment
  72. 2026-09-22 22:39 UTCGHSA enrichment
  73. 2026-09-22 19:36 UTCCISA KEV update
  74. 2026-09-22 18:31 UTCEG score recompute
  75. 2026-09-22 18:31 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 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 attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
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 (CRITICAL).
Which products are affected by CVE-2020-11899?
CVE-2020-11899 affects Treck TCP/IP stack IPv6.
How do I remediate CVE-2020-11899?
No fix for CVE-2020-11899 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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