CVE-2021-31876

Name
CVE-2021-31876
Description
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.
NVD Severity
medium
Other trackers
Mailing lists
Exploits
Forges
GitHub (code, issues), Aports (code, issues)

References

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

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:bitcoin:bitcoin:*:*:*:*:*:*:*:* bitcoin >= 0.12.0 <= 0.21.1

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
bitcoin 3.14-community 0.21.1-r0 Stuart Cardall <developer@it-offshore.co.uk> possibly vulnerable