CVE-2021-39137

Name: CVE-2021-39137
Creator: NVD / NIST
Published: 2021-08-24T16:15:11.007+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.53%

Last modified Jun 17, 2026

CVE-2021-39137 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. go-ethereum is the official Go implementation of the Ethereum protocol. In affected versions a consensus-vulnerability in go-ethereum (Geth) could cause a chain split, where vulnerable versions refuse to accept the canonical chain. EPSS estimates a 1.53% chance of exploitation in the next 30 days.

Description

go-ethereum is the official Go implementation of the Ethereum protocol. In affected versions a consensus-vulnerability in go-ethereum (Geth) could cause a chain split, where vulnerable versions refuse to accept the canonical chain. Further details about the vulnerability will be disclosed at a later date. A patch is included in the upcoming `v1.10.8` release. No workaround are available.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.53%

71.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ethereum	Go Ethereum	>= 1.10.0, < 1.10.8

References

https://github.com/ethereum/go-ethereum/releases/tag/v1.10.8Third Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-9856-9gg9-qcmqThird Party Advisory
https://github.com/ethereum/go-ethereum/releases/tag/v1.10.8Third Party Advisory
https://github.com/ethereum/go-ethereum/security/advisories/GHSA-9856-9gg9-qcmqThird Party Advisory

Timeline

Published: Aug 24, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39137?

How severe is CVE-2021-39137?

CVE-2021-39137 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39137?

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-2021-39137?

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

Scan your code now

Source: NVD / NIST