How severe is CVE-2021-29511?

CVE-2021-29511 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-29511 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29511?

CVE-2021-29511 primarily affects Evm Project Evm. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-29511?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-29511 published?

CVE-2021-29511 was published on 2021-05-12 and last updated on 2026-06-17.

CVE-2021-29511

CVE-2021-29511 is a medium-severity vulnerability in Evm Project Evm with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Evm Project Evm
Published: 2021-05-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-29511?: 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.
How severe is CVE-2021-29511?: CVE-2021-29511 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-29511 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29511?: CVE-2021-29511 primarily affects Evm Project Evm. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-29511?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29511 published?: CVE-2021-29511 was published on 2021-05-12 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:a:evm_project:evm:*:*:*:*:*:rust:*:*
cpe:2.3:a:evm_project:evm:0.22.0:*:*:*:*:rust:*:*
cpe:2.3:a:evm_project:evm:0.23.0:*:*:*:*:rust:*:*
cpe:2.3:a:evm_project:evm:0.24.0:*:*:*:*:rust:*:*
cpe:2.3:a:evm_project:evm:0.25.0:*:*:*:*:rust:*:*
cpe:2.3:a:evm_project:evm:0.26.0:*:*:*:*:rust:*:*

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