What’s Vulnerable › Vulnerabilities

CVE-2012-1909

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2012-08-06 · updated 2026-06-16
• Weakness: CWE-16

Description

The Bitcoin protocol, as used in bitcoind before 0.4.4, wxBitcoin, Bitcoin-Qt, and other programs, does not properly handle multiple transactions with the same identifier, which allows remote attackers to cause a denial of service (unspendable transaction) by leveraging the ability to create a duplicate coinbase transaction.

Affected products

• Bitcoin Core: through 0.4.4; 0.3.4, 0.3.5, 0.3.8, 0.3.10, 0.3.11, 0.3.12 (+3)
• Bitcoin Wxbitcoin: all versions

References

• http://r6.ca/blog/20120206T005236Z.html
• http://sourceforge.net/mailarchive/forum.php?thread_name=CAPg%2BsBhmGHnMResVxPDZdfpmWTb9uqD0RrQD7oSXBQq7oHpm8g%40mail.gmail.com&forum_name=bitcoin-development
• https://bitcointalk.org/index.php?topic=67738.0
• https://bugs.gentoo.org/show_bug.cgi?id=407793
• https://en.bitcoin.it/wiki/BIP_0030
• https://en.bitcoin.it/wiki/CVEs
• https://github.com/sipa/bitcoin/commit/a206b0ea12eb4606b93323268fc81a4f1f952531
• http://r6.ca/blog/20120206T005236Z.html
• http://sourceforge.net/mailarchive/forum.php?thread_name=CAPg%2BsBhmGHnMResVxPDZdfpmWTb9uqD0RrQD7oSXBQq7oHpm8g%40mail.gmail.com&forum_name=bitcoin-development
• https://bitcointalk.org/index.php?topic=67738.0
• https://bugs.gentoo.org/show_bug.cgi?id=407793
• https://en.bitcoin.it/wiki/BIP_0030

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