CVE-2023-27892Public exploit

Mnemonic disclosure via unchecked Ethereum transaction offsets

Published May 2, 2023 · Updated Jan 30, 2025

Out-of-bounds read in ShapeShift KeepKey firmware before 7.7.0 allows attackers to display device memory via crafted USB messages. The cf_confirmExecTx() path trusts attacker-controlled offset and length values, computes a pointer outside data_initial_chunk, and formats the referenced bytes for the OLED display. Exploitation requires physical access to a PIN-unlocked device and transaction confirmations; it can expose the BIP39 mnemonic or crash the wallet.

CVSS severity3.8
Low
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in ShapeShift KeepKey firmware before 7.7.0 allows attackers to display device memory via crafted USB messages. The cf_confirmExecTx() path trusts attacker-controlled offset and length values, computes a pointer outside data_initial_chunk, and formats the referenced bytes for the OLED display. Exploitation requires physical access to a PIN-unlocked device and transaction confirmations; it can expose the BIP39 mnemonic or crash the wallet.

The record

CVE
CVE-2023-27892
Published
May 2, 2023
Updated
Jan 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, CWE-120
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. May 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.7NVDCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
3.8MITRE CNACVSS:3.1/AC:H/AV:P/A:N/C:H/I:N/PR:H/S:U/UI:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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