Vulnerability CVE-2020-26264
Published: 2020-12-11

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.

Type:

CWE-400

 (Uncontrolled Resource Consumption ('Resource Exhaustion'))

CVSS2 => (AV:N/AC:L/Au:S/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4/10
2.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Ethereum -> Go ethereum 

 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
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