7.1

CVE-2020-26241: ethereum go_ethereum Incorrect Calculation

CVSS: 7.1v3.1HighModified
AliasesGHSA-69v6-xc2j-r2jfGO-2022-0771
Published 25-11-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-26241 is a high (CVSS 7.1) Incorrect Calculation vulnerability in ethereum go_ethereum. EPSS estimates a 1.23% chance of exploitation in the next 30 days, higher than 68.4% of scored vulnerabilities.

Overall risk
29/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (NVD)
EPSS score
1.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2025:15424-1

Timeline

  1. 25-11-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. This is a Consensus vulnerability in Geth before version 1.9.17 which can be used to cause a chain-split where vulnerable nodes reject the canonical chain. Geth's pre-compiled dataCopy (at 0x00...04) contract did a shallow copy on invocation. An attacker could deploy a contract that writes X to an EVM memory region R, then calls 0x00..04 with R as an argument, then overwrites R to Y, and finally invokes the RETURNDATACOPY opcode. When this contract is invoked, a consensus-compliant node would push X on the EVM stack, whereas Geth would push Y. This is fixed in version 1.9.17.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.23%

Chance of exploitation in the next 30 days

Percentile

68%

Versus all other CVEs

30-day change

0.00 pp

From 1.23% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ethereum2 products
Github.com/ethereum1 product
  • go-ethereum≥ 1.9.7, < 1.9.17

2 vendors · 3 products

References

6 links