7.5
HIGH
CVE-2021-20838
Microsoft Office Server Document Converter XXE DoS Vuln
Description

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.

INFO

Published Date :

Nov. 1, 2021, 2:15 a.m.

Last Modified :

Nov. 8, 2021, 7:04 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-20838 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Antennahouse office_server_document_converter
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-20838.

URL Resource
https://jvn.jp/en/jp/JVN33453839/index.html Third Party Advisory
https://www.antenna.co.jp/news/2021/osdc72-20211027.html Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-20838 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-20838 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Nov. 08, 2021

    Action Type Old Value New Value
    Removed CPE Configuration OR *cpe:2.3:a:antennahouse:office_server_document_converter:*:*:*:*:*:*:*:* versions up to (excluding) 5.2 *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr10:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr11:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr12:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr8:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr9:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr10:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr8:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr9:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr8:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr4:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:a:antennahouse:office_server_document_converter:*:*:*:*:*:*:*:* versions up to (excluding) 5.2 *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr2:*:*:pro:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:*:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:*:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr4:*:*:*:*:*:*
  • Initial Analysis by [email protected]

    Nov. 02, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://jvn.jp/en/jp/JVN33453839/index.html No Types Assigned https://jvn.jp/en/jp/JVN33453839/index.html Third Party Advisory
    Changed Reference Type https://www.antenna.co.jp/news/2021/osdc72-20211027.html No Types Assigned https://www.antenna.co.jp/news/2021/osdc72-20211027.html Patch, Vendor Advisory
    Added CWE NIST CWE-611
    Added CPE Configuration OR *cpe:2.3:a:antennahouse:office_server_document_converter:*:*:*:*:*:*:*:* versions up to (excluding) 5.2 *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr10:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr11:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr12:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr8:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:5.2:mr9:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr10:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr8:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.0:mr9:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:6.1:mr8:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.0:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr4:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr5:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr6:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.1:mr7:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:-:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr1:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr2:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr3:*:*:*:*:*:* *cpe:2.3:a:antennahouse:office_server_document_converter:7.2:mr4:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-20838 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-20838 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.28 }} 0.04%

score

0.68613

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability