CVE-2021-21369 is a denial-of-service vulnerability affecting Hyperledger Besu versions prior to 1.5.1, specifically within its HTTP JSON-RPC API service. An authenticated attacker with a valid username can overload the login endpoint with invalid password attempts, causing legitimate requests to fail due to inefficient password validation on the main event loop. This vulnerability has a CVSS score of 6.5 (Medium), indicating a network-based attack with low complexity, requiring low privileges, and resulting in high availability impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.5.1CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:besu:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.