CVE-2021-41153Network attack vector

Mainnet consensus divergence via reversed JUMPI validation

Published Oct 18, 2021 · Updated Aug 4, 2024

Control-flow error in Rust EVM before 0.31.0 allows remote attackers to cause Ethereum mainnet consensus divergence via crafted bytecode. The JUMPI handler validates the destination before testing the condition, so a false jump with an invalid destination is rejected instead of falling through. The flaw is security-exploitable only in Ethereum mainnet use; the vendor reports no security exploit for Frontier or standalone blockchains.

CVSS severity8.7
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Control-flow error in Rust EVM before 0.31.0 allows remote attackers to cause Ethereum mainnet consensus divergence via crafted bytecode. The JUMPI handler validates the destination before testing the condition, so a false jump with an invalid destination is rejected instead of falling through. The flaw is security-exploitable only in Ethereum mainnet use; the vendor reports no security exploit for Frontier or standalone blockchains.

The record

CVE
CVE-2021-41153
Published
Oct 18, 2021
Updated
Aug 4, 2024
Vendor
rust-ethereum
Product
Rust EVM
Classifications
CWE-670
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.31.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

rust-ethereum · Rust EVMversion=< 0.31.0

Published CVSS scores

9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.7GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
7.5NISTAV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-670Always-Incorrect Control Flow Implementation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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