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Vulnerability Details : CVE-2021-31876

Bitcoin Core 0.12.0 through 0.21.1 does not properly implement the replacement policy specified in BIP125, which makes it easier for attackers to trigger a loss of funds, or a denial of service attack against downstream projects such as Lightning network nodes. An unconfirmed child transaction with nSequence = 0xff_ff_ff_ff, spending an unconfirmed parent with nSequence <= 0xff_ff_ff_fd, should be replaceable because there is inherited signaling by the child transaction. However, the actual PreChecks implementation does not enforce this. Instead, mempool rejects the replacement attempt of the unconfirmed child transaction.
Publish Date : 2021-05-13 Last Update Date : 2021-05-26
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- CVSS Scores & Vulnerability Types

CVSS Score
6.4
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 863

- Products Affected By CVE-2021-31876

# Product Type Vendor Product Version Update Edition Language
1 Application Bitcoin Bitcoin * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Bitcoin Bitcoin 1

- References For CVE-2021-31876

https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2021-May/018893.html
https://github.com/bitcoin/bitcoin
https://bitcoinops.org/en/topics/replace-by-fee/
https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures#CVE-2021-31876
https://bitcoinops.org/en/newsletters/2021/05/12/

- Metasploit Modules Related To CVE-2021-31876

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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