CVE-2021-40511: Obdasystems Mastro

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

OBDA systems’ Mastro 1.0 is vulnerable to XML Entity Expansion (aka “billion laughs”) attack allowing denial of service.

Affected products

• Obdasystems Mastro: version 1.0 only

Published 2022-06-21. Last modified 2026-06-17.