CASCACascade Atlas

Evidence dossier

CVE-2020-11899

CVE-2020-11899

60.6–77.1Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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

State
PUBLISHED
Published
Jun 17, 2020
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS18.56%

2026-07-18 · v2026.06.15 · percentile 96.9%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

mitreoriginal assertion
container

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

CISA KEVoriginal assertion
observed_exploitation

Treck TCP/IP stack Out-of-Bounds Read Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.185640000000; percentile 0.969330000000

Applicability

Cited product scope

Trace impact →
n/an/a
[{"status": "affected", "version": "n/a"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:treck:tcp\/ip:*:*:*:*:*:*:*:*; end excluding 6.0.1.66supported
Unknown vendorUnknown product
cpe:2.3:h:dell:wyse_5030:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:dell:wyse_5050_all-in-one:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:dell:wyse_7030:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:o:dell:wyse_5030_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:dell:wyse_5050_all-in-one_firmware:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:dell:wyse_7030_firmware:-:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

5.4
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
4.8
nvd@nist.govCVSS 2.0 · role PrimaryAV:A/AC:L/Au:N/C:N/I:P/A:P
5.4
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
5.4
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.