CVE-2021-31684: JSON-Smart Project JSON-Smart-v1

High severity, CVSS 7.5. EPSS: 2.3% chance of exploitation in the next 30 days.

A vulnerability was discovered in the indexOf function of JSONParserByteArray in JSON Smart versions 1.3 and 2.4 which causes a denial of service (DOS) via a crafted web request.

Affected products

• JSON-Smart Project JSON-Smart-v1: from 1.3, before 1.3.3 (fixed in 1.3.3)
• JSON-Smart Project JSON-Smart-v2: from 2.4, before 2.4.4 (fixed in 2.4.4)
• Oracle Utilities Framework: version 4.4.0.0.0 only; version 4.4.0.2.0 only; version 4.4.0.3.0 only

Published 2021-06-01. Last modified 2026-06-17.