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CVE-2020-26265— Consensus flaw during block processing

Quick assessment

Affected
ethereum go-ethereum
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ethereum Go-ethereum是Ethereum社区的一个用Go语言实现以太坊协议的代码库。 Go Ethereum 1.9.4 and before version 1.9.20存在安全漏洞，该漏洞源于可能导致链断裂，其中脆弱版本拒绝接受规范链。

CVSS 5.3 · Medium EPSS 0.91% · P57

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2020-26265

Vulnerability Information
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Vulnerability Title
Consensus flaw during block processing
Source: CVE Program / CVE List V5
Vulnerability Description
Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. In Geth from version 1.9.4 and before version 1.9.20 a consensus-vulnerability could cause a chain split, where vulnerable versions refuse to accept the canonical chain. The fix was included in the Paragade release version 1.9.20. No individual workaround patches have been made -- all users are recommended to upgrade to a newer version.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Go Ethereum and before version 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ethereum Go-ethereum是Ethereum社区的一个用Go语言实现以太坊协议的代码库。 Go Ethereum 1.9.4 and before version 1.9.20存在安全漏洞，该漏洞源于可能导致链断裂，其中脆弱版本拒绝接受规范链。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ethereum go-ethereum >= 1.9.4, < 1.9.20 -

II. Public POCs for CVE-2020-26265

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III. Intelligence Information for CVE-2020-26265

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Vendor Advisories for CVE-2020-26265 (1)

Other References for CVE-2020-26265 (1)

IV. Related Vulnerabilities

Same product: go-ethereum
Same vendor: ethereum
Same weakness: CWE-682

V. Comments for CVE-2020-26265

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