CVE-2021-43668

Name: CVE-2021-43668
Creator: NVD / NIST
Published: 2021-11-18T16:15:09.23+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2021-43668 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Go-Ethereum 1.10.9 nodes crash (denial of service) after receiving a serial of messages and cannot be recovered. They will crash with "runtime error: invalid memory address or nil pointer dereference" and arise a SEGV signal.. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

Description

Go-Ethereum 1.10.9 nodes crash (denial of service) after receiving a serial of messages and cannot be recovered. They will crash with "runtime error: invalid memory address or nil pointer dereference" and arise a SEGV signal.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.25%

16.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Ethereum	Go Ethereum	1.10.9

References

https://github.com/ethereum/go-ethereum/issues/23866Third Party Advisory
https://github.com/ethereum/go-ethereum/issues/23866Third Party Advisory

Timeline

Published: Nov 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43668?

How severe is CVE-2021-43668?

CVE-2021-43668 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43668?

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-2021-43668?

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

Scan your code now

Source: NVD / NIST