CVE-2024-34478Known exploitationPublic exploitNetwork attack vector

Chain split via signed transaction-version checks

Published May 5, 2024 · Updated Aug 7, 2024

Consensus-rule error in btcd before 0.24.0 allows remote attackers to split the chain via negative transaction versions. The BIP 68 sequence-lock test and BIP 112 CHECKSEQUENCEVERIFY path compare a signed int32 version directly instead of casting it to uint32. A negative-version transaction must enter a block; disagreement with other Bitcoin implementations can strand the node on a divergent chain and expose dependent users to invalid payments or lost funds.

CVSS severity7.5
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Consensus-rule error in btcd before 0.24.0 allows remote attackers to split the chain via negative transaction versions. The BIP 68 sequence-lock test and BIP 112 CHECKSEQUENCEVERIFY path compare a signed int32 version directly instead of casting it to uint32. A negative-version transaction must enter a block; disagreement with other Bitcoin implementations can strand the node on a divergent chain and expose dependent users to invalid payments or lost funds.

The record

CVE
CVE-2024-34478
Published
May 5, 2024
Updated
Aug 7, 2024
Vendor
btcsuite
Product
btcd
Classifications
CWE-436, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2024Record 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 <0.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

btcsuite · btcdversion=0 <0.24.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A: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.

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No observations available

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

Weakness, pattern, technique

CWE-436Interpretation Conflict
T1499.004Application or System Exploitation

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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