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Vulnerability Details CVE-2023-39363

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). In versions 0.2.15, 0.2.16 and 0.3.0, named re-entrancy locks are allocated incorrectly. Each function using a named re-entrancy lock gets a unique lock regardless of the key, allowing cross-function re-entrancy in contracts compiled with the susceptible versions. A specific set of conditions is required to result in misbehavior of affected contracts, specifically: a `.vy` contract compiled with `vyper` versions `0.2.15`, `0.2.16`, or `0.3.0`; a primary function that utilizes the `@nonreentrant` decorator with a specific `key` and does not strictly follow the check-effects-interaction pattern (i.e. contains an external call to an untrusted party before storage updates); and a secondary function that utilizes the same `key` and would be affected by the improper state caused by the primary function. Version 0.3.1 contains a fix for this issue.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 22.6%
CVSS Severity
CVSS v3 Score 5.9
Products affected by CVE-2023-39363
  • Vyperlang » Vyper » Version: 0.2.15
    cpe:2.3:a:vyperlang:vyper:0.2.15
  • Vyperlang » Vyper » Version: 0.2.16
    cpe:2.3:a:vyperlang:vyper:0.2.16
  • Vyperlang » Vyper » Version: 0.3.0
    cpe:2.3:a:vyperlang:vyper:0.3.0


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