CVE-2021-20839 json
Office Server Document Converter V7.2MR4 and earlier and V7.1MR7 and earlier allows a remote unauthenticated attacker to conduct an XML Ext…
published 2021-11-01 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8251
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 66%
- public exploits
- 0
- none known
Summary
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 to the other servers by processing a specially crafted XML document.
Patch / fix
- antennahouse office_server_document_converter 5.2
Exploit prediction
1.14% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
Affected products
- Antenna House, Inc. Office Server Document Converter
Classification
- Weakness
-
- CWE-611 Improper Restriction of XML External Entity Reference
References
-
antenna.co.jp
/news/2021/osdc72-20211027.html
patch, vendor-advisory
-
jvn.jp
/en/jp/JVN33453839/index.html
third-party-advisory
Sources
- CVE List CVE-2021-20839
- NVD CVE-2021-20839
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.