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Advisories

Electrum before 4.8.3 Missing Signature Verification of Mempool Transactions

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Severity
critical
Date
Affecting

  • electrum >= 0, < 4.8.3

CWE
  • CWE-347 Improper Verification of Cryptographic Signature
CVSS
9.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Raju-K12
Description
Electrum before 4.8.3 fails to verify signatures of wallet-owned inputs in unconfirmed mempool transactions, allowing malicious servers to replace a just-broadcast transaction with a conflicting one. Attackers can swallow the user's transaction and display an invalid zero-fee copy paying an attacker address, tricking users into RBF fee-bumping and signing it.

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