HOMEVULNERABILITIESCVE-2021-29511
MEDIUM

CVE-2021-29511

CWE-770Published: May 12, 2021· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-29511 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

evm_project1 product(s)
evm
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8dd
PATCHhttps://github.com/rust-blockchain/evm/security/advisories/GHSA-4jwq-572w-4388
PATCHhttps://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8dd
PATCHhttps://github.com/rust-blockchain/evm/security/advisories/GHSA-4jwq-572w-4388
ADVISORYhttps://crates.io/crates/evm
ADVISORYhttps://crates.io/crates/evm

All References (6)

→
https://crates.io/crates/evmThird Party Advisory
→
https://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8ddPatch · Third Party Advisory
→
https://github.com/rust-blockchain/evm/security/advisories/GHSA-4jwq-572w-4388Patch · Third Party Advisory
→
https://crates.io/crates/evmThird Party Advisory
→
https://github.com/rust-blockchain/evm/commit/19ade858c430ab13eb562764a870ac9f8506f8ddPatch · Third Party Advisory
→
https://github.com/rust-blockchain/evm/security/advisories/GHSA-4jwq-572w-4388Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2021-29511
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-770
CISA KEVNo
Affected1 vendor(s)
PublishedMay 12, 2021

Related CVEs (CWE-770)

CVE-2022-3456
9.8
CVE-2022-3273
9.8
CVE-2018-20033
9.8
CVE-2025-11832
9.8
CVE-2019-17067
9.8
CVE-2023-25156
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-29511 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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