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TI-2021-04468 Aliases CVE-2021-21369

Potential DoS in Besu HTTP JSON-RPC API

Priority LOW 32CWE-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. Impact type from CWE-400.

Summary

Hyperledger Besu is an open-source, MainNet compatible, Ethereum client written in Java. In Besu before version 1.5.1 there is a denial-of-service vulnerability involving the HTTP JSON-RPC API service. If username and password authentication is enabled for the HTTP JSON-RPC API service, then prior to making any requests to an API endpoint the requestor must use the login endpoint to obtain a JSON web token (JWT) using their credentials. A single user can readily overload the login endpoint with invalid requests (incorrect password). As the supplied password is checked for validity on the main vertx event loop and takes a relatively long time this can cause the processing of other valid requests to fail. A valid username is required for this vulnerability to be exposed. This has been fixed in version 1.5.1.

Why it matters now

EPSS 0.01668 76th percentileScored 2026-11-07
Fix Fixed besu (hyperledger): 1.5.1

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
hyperledgerbesubefore 1.5.11.5.1Patch availableCNA
  • besu Vendorhyperledger Affected before 1.5.1 Fixed in 1.5.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:besu:*:*:*:*:*:*:*:*before 1.5.1Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:besu:*:*:*:*:*:*:*:* Versions before 1.5.1 Vulnerable ·backstage

Remediation

  • Fix · CNA besu (hyperledger) Fixed in 1.5.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-21369

References

Patch 2

Advisory 2

  • TI-2026-30139 ObjectInputStream.readObject() without ObjectInputFilter in fabric-sdk-java allows Java deserialization RCE CVSS 4.0CRITICAL 9.3
  • TI-2024-14390 Hyperledger Aries Cloud Agent Python result of presentation verification not checked for LDP-VC CVSS 3.1CRITICAL 9.9
  • TI-2022-13066 Unlinkability broken in ursa when verifiers use malicious keys CVSS 3.1MEDIUM 5.3
  • TI-2022-16450 Incorrect Conversion between Numeric Types in Besu Ethereum Client CVSS 3.1CRITICAL 9.1
  • TI-2022-13065 Remote code execution in Indy's NODE_UPGRADE transaction CVSS 3.1HIGH 8.8
  • TI-2025-21486 ALTBN128_ADD, ALTBN128_MUL, ALTBN128_PAIRING precompile functions do not check if points are on curve CVSS 4.0HIGH 8.7
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences