XML External Entity injection in Office Server Document Converter - CVE-2021-20838

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Main Vulnerability Database Vulnerabilities #VU57778

XML External Entity injection in Office Server Document Converter - CVE-2021-20838

Published: October 29, 2021


Vulnerability identifier: #VU57778
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-20838
CWE-ID: CWE-611
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Antenna House
Affected software:
Office Server Document Converter

Detailed vulnerability description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied XML input in the PDF convert server. A remote attacker can pass a specially crafted XML code to the affected application and cause a denial of service condition on the target system.


How to mitigate CVE-2021-20838

Install updates from vendor's website.

Sources