AUGUST 4, 2026
Live Feed
Back to database
Case File

CVE-2018-20421

HIGH · CVSS 7.5 EPSS 1.46% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2018-12-24 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.5. Public exploit code or proof-of-concept references have been detected in its references. It may lead to a denial-of-service condition.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2018-20421
Severity
HIGH
CVSS
7.5
EPSS
1.46%

Original NVD Description

Go Ethereum (aka geth) 1.8.19 allows attackers to cause a denial of service (memory consumption) by rewriting the length of a dynamic array in memory, and then writing data to a single memory location with a large index number, as demonstrated by use of "assembly { mstore }" followed by a "c[0xC800000] = 0xFF" assignment.

Related CVEs

Other vulnerabilities affecting the same vendor(s)