// For flags

CVE-2021-31876

 

Severity Score

6.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Bitcoin Core desde la versión 0.12.0 hasta la versión 0.21.1 no implementa correctamente la política de reemplazo especificada en BIP125, lo que hace más fácil para los atacantes desencadenar una pérdida de fondos, o un ataque de denegación de servicio contra proyectos posteriores como los nodos de la red Lightning. Una transacción hija no confirmada con nSequence = 0xff_ff_ff_ff, que gasta un padre no confirmado con nSequence &lt;= 0xff_ff_ff_fd, debería ser reemplazable porque hay una señalización heredada por la transacción hija. Sin embargo, la implementación real de PreChecks no hace cumplir esto. En su lugar, mempool rechaza el intento de reemplazo de la transacción hija no confirmada.arameter

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-04-29 CVE Reserved
  • 2021-05-13 CVE Published
  • 2024-01-27 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-863: Incorrect Authorization
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Bitcoin
Search vendor "Bitcoin"
 Bitcoin
Search vendor "Bitcoin" for product "Bitcoin"
 >= 0.12.0 <= 0.21.1
Search vendor "Bitcoin" for product "Bitcoin" and version " >= 0.12.0 <= 0.21.1"
-
Affected