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Fencer Vulns
low 3.8

CVE-2023-27892 json

Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.7.0 allow a global buffer overflow via crafted messa…

published 2023-05-02 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-31626

cvss
3.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

Insufficient length checks in the ShapeShift KeepKey hardware wallet firmware before 7.7.0 allow a global buffer overflow via crafted messages. Flaws in cf_confirmExecTx() in ethereum_contracts.c can be used to reveal arbitrary microcontroller memory on the device screen or crash the device. With physical access to a PIN-unlocked device, attackers can extract the BIP39 mnemonic secret from the hardware wallet.

Patch / fix

  • shapeshift keepkey_firmware 7.7.0

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • blog.inhq.net https://blog.inhq.net/posts/keepkey-CVE-2023-27892/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.8 CVSS:3.1/AC:H/AV:P/A:N/C:H/I:N/PR:H/S:U/UI:N
CNA 3.1 3.8 CVSS:3.1/AV:P/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 5.7 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input
  • CWE-125 Out-of-bounds Read

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.