CVE-2021-29511 MEDIUM

CVE-2021-29511: Memory over-allocation in evm crate

Vendor Rust-Blockchain
Product evm
Weakness CWE-770 · Uncontrolled resource consumption
Published May 12, 2021
Last update August 3, 2024

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

evm is a pure Rust implementation of Ethereum Virtual Machine. Prior to the patch, when executing specific EVM opcodes related to memory operations that use `evm_core::Memory::copy_large`, the `evm` crate can over-allocate memory when it is not needed, making it possible for an attacker to perform denial-of-service attack. The flaw was corrected in commit `19ade85`. Users should upgrade to `==0.21.1, ==0.23.1, ==0.24.1, ==0.25.1, >=0.26.1`. There are no workarounds. Please upgrade your `evm` crate version.

Key dates

02Disclosure timeline

May 12, 2021 CVE published
August 3, 2024 Record updated