CVE-2021-20838: Antennahouse Office Server Document Converter

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

Office Server Document Converter V7.2MR4 and earlier and V7.1MR7 and earlier allows a remote unauthenticated attacker to conduct an XML External Entity (XXE) attack to cause a denial of service (DoS) condition by processing a specially crafted XML document.

Affected products

• Antennahouse Office Server Document Converter: before 5.2 (fixed in 5.2); version 5.2 only; version 6.0 only; version 6.1 only; version 7.0 only; version 7.1 only; …

Published 2021-11-01. Last modified 2026-06-17.