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TI-2020-16085 Aliases CVE-2020-26264GHSA-r33q-22hv-j29q

LES Server DoS via GetProofsV2

Priority LOW 33CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

Go Ethereum, or "Geth", is the official Golang implementation of the Ethereum protocol. In Geth before version 1.9.25 a denial-of-service vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client. This vulnerability only concerns users explicitly enabling les server; disabling les prevents the exploit. The vulnerability was patched in version 1.9.25.

Why it matters now

EPSS 0.01886 79th percentileScored 2026-11-07
Fix Fixed go-ethereum (ethereum): 1.9.25github.com/ethereum/go-ethereum (Go): 1.9.25

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
ethereumgo-ethereumbefore 1.9.251.9.25Patch availableCNA
—github.com/ethereum/go-ethereum (Go)before 1.9.251.9.25Patch availableGHSA-r33q-22hv-j29q
  • go-ethereum Vendorethereum Affected before 1.9.25 Fixed in 1.9.25 Patch available CNA
  • github.com/ethereum/go-ethereum (Go) Vendor— Affected before 1.9.25 Fixed in 1.9.25 Patch available GHSA-r33q-22hv-j29q

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:*before 1.9.25Vulnerableethereum
  • cpe:2.3:a:ethereum:go_ethereum:*:*:*:*:*:*:*:* Versions before 1.9.25 Vulnerable ·ethereum

Remediation

  • Fix · CNA go-ethereum (ethereum) Fixed in 1.9.25
  • Fix · GHSA-r33q-22hv-j29q github.com/ethereum/go-ethereum (Go) Fixed in 1.9.25 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-26264
  2. 2026-10-03 Alias added: GHSA-r33q-22hv-j29q

References

Patch 2

Advisory 3

Other 2

  • 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