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    CVE-2018-20421

    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.

    Published:Dec 24, 2018
    Last Modified:Nov 21, 2024
    EPS:Dec 24, 2018
    EPSS Score:0.00334
    CVSS Score:7.5

    Affected Products

    Vendor
    Ethereum
    Product
    Go Ethereum

    Exploits

    https://github.com/ethereum/go-ethereum/issues/18289https://github.com/ethereum/go-ethereum/issues/18289

    Related CVEs

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    CVE-2026-26313 (CVSS 6.9) — go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. Prior to version 1.17.…
    CVE-2026-22868 (CVSS 7.1) — go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. A vulnerable node can …
    CVE-2026-22862 (CVSS 7.1) — go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. A vulnerable node can …
    CVE-2025-24883 (CVSS 8.7) — go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. A vulnerable node can …
    CVE-2024-32972 (CVSS 7.5) — go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. Prior to 1.13.15, a vu…
    CVE-2023-42319 (CVSS 7.5) — Geth (aka go-ethereum) through 1.13.4, when --http --graphql is used, allows remote attackers to cause a denia…
    CVE-2023-40591 (CVSS 7.5) — go-ethereum (geth) is a golang execution layer implementation of the Ethereum protocol. A vulnerable node, can…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High