{"id":"CVE-2021-29511","aliases":["GHSA-4jwq-572w-4388"],"title":"Memory over-allocation in evm crate","summary":"Memory over-allocation in evm crate","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"evm","product":"evm","ecosystem":"rust","affected":["evm < 0.21.1","evm-core < 0.21.1","evm >= 0.22.0, < 0.22.1","evm >= 0.23.0, < 0.23.1","evm >= 0.24.0, < 0.24.1","evm >= 0.25.0, < 0.25.1","evm >= 0.26.0, < 0.26.1","evm-core >= 0.22.0, < 0.22.1","evm-core >= 0.23.0, < 0.23.1","evm-core >= 0.24.0, < 0.24.1","evm-core >= 0.25.0, < 0.25.1","evm-core >= 0.26.0, < 0.26.1"],"patched":["evm 0.21.1","evm-core 0.21.1","evm 0.22.1","evm 0.23.1","evm 0.24.1","evm 0.25.1","evm 0.26.1","evm-core 0.22.1","evm-core 0.23.1","evm-core 0.24.1","evm-core 0.25.1","evm-core 0.26.1"],"published":"2024-01-30","updated":"2026-07-08","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-4jwq-572w-4388","references":[{"url":"https://github.com/rust-blockchain/evm/security/advisories/GHSA-4jwq-572w-4388"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29511"},{"url":"https://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8dd"}],"tags":["osv","rust"],"epss":0.0128,"epssPercentile":0.68771,"ingestedAt":"2026-07-09T18:56:37.272Z","slug":"CVE-2021-29511","body":"## Overview\n\n### Impact\nPrior to the patch, when executing specific EVM opcodes related to memory operations that use `evm_core::Memory::copy_large`, the crate can over-allocate memory when it is not needed, making it possible for an attacker to perform denial-of-service attack.\n\n### Patches\nThe 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`.\n\n### Workarounds\nNone. Please upgrade your `evm` crate version\n\n### References\nFix commit: https://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8dd\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [evm repo](https://github.com/rust-blockchain/evm)\n* Email [Wei](mailto:wei@that.world)\n\n\n## Affected packages\n\n- `evm < 0.21.1`\n- `evm-core < 0.21.1`\n- `evm >= 0.22.0, < 0.22.1`\n- `evm >= 0.23.0, < 0.23.1`\n- `evm >= 0.24.0, < 0.24.1`\n- `evm >= 0.25.0, < 0.25.1`\n- `evm >= 0.26.0, < 0.26.1`\n- `evm-core >= 0.22.0, < 0.22.1`\n- `evm-core >= 0.23.0, < 0.23.1`\n- `evm-core >= 0.24.0, < 0.24.1`\n- `evm-core >= 0.25.0, < 0.25.1`\n- `evm-core >= 0.26.0, < 0.26.1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `evm 0.21.1`\n- `evm-core 0.21.1`\n- `evm 0.22.1`\n- `evm 0.23.1`\n- `evm 0.24.1`\n- `evm 0.25.1`\n- `evm 0.26.1`\n- `evm-core 0.22.1`\n- `evm-core 0.23.1`\n- `evm-core 0.24.1`\n- `evm-core 0.25.1`\n- `evm-core 0.26.1`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.3,"exploitation":0,"ransomware":0},"changes":[]}