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TI-2018-14466 Aliases CVE-2018-20421GHSA-5g4w-3m99-4m2p

Go Ethereum (aka geth) 1.8.19 allows attackers to cause a denial of service (memory…

Priority LOW 36CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-770.

Summary

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.

Why it matters now

EPSS 0.01456 73rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ethereum:go_ethereum:1.8.19:*:*:*:*:*:*:*1.8.19Vulnerableethereum
  • cpe:2.3:a:ethereum:go_ethereum:1.8.19:*:*:*:*:*:*:* Versions 1.8.19 Vulnerable ·ethereum

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-20421
  2. 2026-10-03 Alias added: GHSA-5g4w-3m99-4m2p

References

Exploit 1

  • TI-2023-22561 Geth (aka go-ethereum) through 1.13.4, when --http --graphql is used, allows remote… CVSS 3.1HIGH 7.5
  • TI-2026-21270 Go Ethereum affected by DoS via malicious p2p message CVSS 4.0HIGH 8.7
  • TI-2023-21389 Denial of service via malicious p2p message in go-ethereum CVSS 3.1HIGH 7.5
  • TI-2018-08612 The GetBlockHeadersMsg handler in the LES protocol implementation in Go Ethereum (aka… CVSS 3.0HIGH 7.5
  • TI-2026-21271 Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake CVSS 4.0MEDIUM 6.9
  • TI-2026-21269 Go Ethereum affected by DoS via malicious p2p message CVSS 4.0MEDIUM 6.9
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences