Vulnerability identifier: #VU48993

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-26265

CWE-ID: CWE-254

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
go-ethereum
Other software / Other software solutions

Vendor: Ethereum

Description

The vulnerability allows a remote attacker to bypass security features.

The vulnerability exists due to a consensus flaw. A remote attacker can send a specially crafted request abd cause a chain split.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

go-ethereum: 1.9.4 - 1.9.19

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External links
http://github.com/ethereum/go-ethereum/releases/tag/v1.9.20
http://github.com/ethereum/go-ethereum/security/advisories/GHSA-xw37-57qp-9mm4

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.