XML External Entity injection in Office Server Document Converter - CVE-2021-20838
Published: October 29, 2021
Vulnerability identifier: #VU57778
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2021-20838
CWE-ID: CWE-611
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Office Server Document Converter
How to mitigate CVE-2021-20838
Install updates from vendor's website.
Office Server Document Converter - addressed in versions V5.2MR14, V6.0MR12, V6.1MR9, V7.0MR7, V7.1MR8, V7.2MR5