CVE-2021-40511

7.5 highEPSS 0.9%

High (7.5) in obdasystems mastro. 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.

Severity

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 61% of CVEs (scores of 2026-10-31)
CWE: CWE-776
Published: 2022-06-21
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19