A DoS vulnerability can make a LES server crash via malicious GetProofsV2 request from a connected LES client.
The vulnerability was patched in https://github.com/ethereum/go-ethereum/pull/21896.
This vulnerability only concerns users explicitly enabling les server; disabling les prevents the exploit.
It can also be patched by manually applying the patch in https://github.com/ethereum/go-ethereum/pull/21896.
If you have any questions or comments about this advisory:
{
"cwe_ids": [
"CWE-400"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-21T21:45:23Z",
"nvd_published_at": null,
"severity": "MODERATE"
}