CVE-2019-18671

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 3.3%, top 13% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

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

Insufficient checks in the USB packet handling of the ShapeShift KeepKey hardware wallet before firmware 6.2.2 allow out-of-bounds writes in the .bss segment via crafted messages. The vulnerability could allow code execution or other forms of impact. It can be triggered by unauthenticated attackers and the interface is reachable via WebUSB.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

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%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
87.1%
KEV
Not listed

Published

December 6, 2019

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated May 27, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit.
github_commit Patch Available

commit b222c66cdd7c (keepkey/keepkey-firmware)

Patch available: keepkey/keepkey-firmware v6.2.2 (contains commit b222c66cdd7c)

https://github.com/keepkey/keepkey-firmware/commit/b222c66cdd7c3203d917c80ba615082d309d80c3
generic🟡 PoC Available

KeepKey receive buffer vulnerability (CVE-2019-18671) | invd blog

https://blog.inhq.net/posts/keepkey-CVE-2019-18671/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 41× 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.

  1. 2026-07-24 14:14 UTCEPSS rescore
  2. 2026-07-24 14:14 UTCEPSS rescore
  3. 2026-07-23 14:15 UTCEPSS rescore
  4. 2026-07-23 01:42 UTCEG score recompute
  5. 2026-07-22 22:22 UTCEG score recompute
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  1. 2026-07-08 15:11 UTCEPSS rescore
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  26. 2026-06-19 19:23 UTCEPSS rescore
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  28. 2026-06-18 17:50 UTCEPSS rescore
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  34. 2026-06-11 13:58 UTCEPSS rescore
  35. 2026-06-10 22:16 UTCEPSS rescore
  36. 2026-06-10 13:19 UTCEPSS rescore
  37. 2026-06-08 14:15 UTCEPSS rescore
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  40. 2026-06-05 22:45 UTCEPSS rescore
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  42. 2026-06-04 13:10 UTCEPSS rescore
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  44. 2026-06-02 20:11 UTCEPSS rescore
  45. 2026-06-02 20:11 UTCEPSS rescore
  46. 2026-06-01 13:50 UTCEPSS rescore
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  48. 2026-05-31 22:29 UTCEPSS rescore
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  50. 2026-05-31 00:14 UTCEPSS rescore
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  52. 2026-05-29 13:42 UTCEPSS rescore
  53. 2026-05-28 13:43 UTCEPSS rescore
  54. 2026-05-27 13:38 UTCEPSS rescore
  55. 2026-05-27 10:50 UTCEG score recompute
  56. 2026-05-27 10:50 UTCGHSA enrichment
  57. 2026-05-26 13:42 UTCEPSS rescore
  58. 2026-05-26 13:42 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2019-18671?
CVE-2019-18671 is a critical vulnerability published on December 6, 2019. Insufficient checks in the USB packet handling of the ShapeShift KeepKey hardware wallet before firmware 6.2.2 allow out-of-bounds writes in the .bss segment via crafted messages. The vulnerability could allow code execution or other forms of impact. It can be triggered by unauthenticated attackers…
When was CVE-2019-18671 disclosed?
CVE-2019-18671 was first published in the National Vulnerability Database on December 6, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-18671 actively exploited?
CVE-2019-18671 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-18671?
CVE-2019-18671 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-18671?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18671, 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.

Dependency Blast Radius

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