CVE-2020-26264

Name: CVE-2020-26264
Creator: NVD / NIST
Published: 2020-12-11T17:15:12.793+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.86%

Last modified Jun 17, 2026

CVE-2020-26264 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. In Geth before version 1.9.25 a denial-of-service vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client. EPSS estimates a 1.86% chance of exploitation in the next 30 days.

Description

Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. In Geth before version 1.9.25 a denial-of-service vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client. This vulnerability only concerns users explicitly enabling les server; disabling les prevents the exploit. The vulnerability was patched in version 1.9.25.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.86%

76.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ethereum	Go Ethereum	< 1.9.25

References

https://github.com/ethereum/go-ethereum/commit/bddd103a9f0af27ef533f04e06ea429cf76b6d46Patch, Third Party Advisory
https://github.com/ethereum/go-ethereum/pull/21896Patch, Third Party Advisory
https://github.com/ethereum/go-ethereum/releases/tag/v1.9.25Third Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-r33q-22hv-j29qThird Party Advisory
https://github.com/ethereum/go-ethereum/commit/bddd103a9f0af27ef533f04e06ea429cf76b6d46Patch, Third Party Advisory
https://github.com/ethereum/go-ethereum/pull/21896Patch, Third Party Advisory
https://github.com/ethereum/go-ethereum/releases/tag/v1.9.25Third Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-r33q-22hv-j29qThird Party Advisory

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26264?

How severe is CVE-2020-26264?

CVE-2020-26264 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.86% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26264?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26264?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST