CVE-2023-7345Network attack vector

Unintended signatures via odd-length hexadecimal truncation

Published May 19, 2026 · Updated May 19, 2026

Integer parsing in Ledger Live before 2.70.0 and @ledgerhq/hw-app-eth before 6.34.7 allows attackers to obtain altered signatures. @ledgerhq/hw-app-eth passes an odd-length hexadecimal integer to Node.js Buffer.from, which drops the final nibble and propagates the reduced value to the device. User approval of the mismatched device hash is required; the resulting signature can authorize unintended blockchain actions, including an asset sale at a lower amount.

CVSS severity6.9
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer parsing in Ledger Live before 2.70.0 and @ledgerhq/hw-app-eth before 6.34.7 allows attackers to obtain altered signatures. @ledgerhq/hw-app-eth passes an odd-length hexadecimal integer to Node.js Buffer.from, which drops the final nibble and propagates the reduced value to the device. User approval of the mismatched device hash is required; the resulting signature can authorize unintended blockchain actions, including an asset sale at a lower amount.

The record

CVE
CVE-2023-7345
Published
May 19, 2026
Updated
May 19, 2026
Vendor
Ledger
Product
Ledger Wallet
Classifications
CWE-704, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.70.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ledger · Ledger Walletversion=0 <2.70.0
Ledger · @ledgerhq/hw-app-ethversion=0 <6.34.7

Published CVSS scores

6.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-704Incorrect Type Conversion or Cast
T1204User Execution

Public exploit references

No public exploit references are available in this record.

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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