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High severity7.5OSV Advisory· Published Dec 24, 2018· Updated Jun 17, 2026

CVE-2018-20421

CVE-2018-20421

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • Ethereum/Go EthereumOSV3 versions
    0.2.2, 0.3.0, 0.3.1, …+ 2 more
    • (no CPE)range: 0.2.2, 0.3.0, 0.3.1, …
    • cpe:2.3:a:ethereum:go_ethereum:1.8.19:*:*:*:*:*:*:*
    • (no CPE)range: <1.8.19

Patches

Vulnerability mechanics

References

1

News mentions

0

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