What’s Vulnerable › Vulnerabilities

CVE-2020-26264: LES Server DoS via GetProofsV2

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-11 · updated 2026-06-17
• Weakness: CWE-400

Description

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.

Affected products

• ethereum go-ethereum: before 1.9.25 — fixed in 1.9.25

How to fix

Upgrade to a fixed version: ethereum go-ethereum 1.9.25. Check the vendor advisory for mitigations.

References

• https://github.com/ethereum/go-ethereum/commit/bddd103a9f0af27ef533f04e06ea429cf76b6d46
• https://github.com/ethereum/go-ethereum/pull/21896
• https://github.com/ethereum/go-ethereum/releases/tag/v1.9.25
• https://github.com/ethereum/go-ethereum/security/advisories/GHSA-r33q-22hv-j29q
• https://github.com/ethereum/go-ethereum/commit/bddd103a9f0af27ef533f04e06ea429cf76b6d46
• https://github.com/ethereum/go-ethereum/pull/21896
• https://github.com/ethereum/go-ethereum/releases/tag/v1.9.25
• https://github.com/ethereum/go-ethereum/security/advisories/GHSA-r33q-22hv-j29q

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