CVE-2021-20838
CVE-2021-20838 is a high-severity vulnerability in Antennahouse Office Server Document Converter with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 1% (71st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-611
- Affected product: Antennahouse Office Server Document Converter
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-20838?
- 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.
- How severe is CVE-2021-20838?
- CVE-2021-20838 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-20838 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-20838?
- CVE-2021-20838 primarily affects Antennahouse Office Server Document Converter. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-20838?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-20838 published?
- CVE-2021-20838 was published on 2021-11-01 and last updated on 2026-06-17.
References
Affected products (23)
- cpe:2.3:a:antennahouse:office_server_document_converter:*:*:*:*:*:*:*:*
- 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:*:*:*:*:*:*
More vulnerabilities in Antennahouse Office Server Document Converter
- CVE-2018-3936 — High (CVSS 8.8): In Antenna House Office Server Document Converter version V6.1 Pro MR2 for Linux64 (6,1,2018,0312), a crafted Microsoft…
- CVE-2018-3933 — High (CVSS 8.8): An exploitable out-of-bounds write exists in the Microsoft Word document conversion functionality of the Antenna House…
- CVE-2018-3932 — High (CVSS 8.8): An exploitable stack-based buffer overflow exists in the Microsoft Word document conversion functionality of the…
- CVE-2018-3931 — High (CVSS 7.8): In Antenna House Office Server Document Converter version V6.1 Pro MR2 for Linux64 (6,1,2018,0312), a crafted Microsoft…
- CVE-2018-3930 — High (CVSS 7.8): In Antenna House Office Server Document Converter version V6.1 Pro MR2 for Linux64 (6,1,2018,0312), a crafted Microsoft…
- CVE-2018-3929 — High (CVSS 7.8): An exploitable heap corruption exists in the PowerPoint document conversion functionality of the Antenna House Office…
All CVEs affecting Antennahouse Office Server Document Converter →
Other CWE-611 (Improper Restriction of XML External Entity Reference (XXE)) vulnerabilities
- CVE-2022-22486 — Critical (CVSS 10.0): IBM Tivoli Workload Scheduler 9.4, 9.5, and 10.1 is vulnerable to an XML External Entity Injection (XXE) attack when…
- CVE-2019-14678 — Critical (CVSS 10.0): SAS XML Mapper 9.45 has an XML External Entity (XXE) vulnerability that can be leveraged by malicious attackers in…
- CVE-2015-9280 — Critical (CVSS 10.0): MailEnable before 8.60 allows XXE via an XML document in the request.aspx Options parameter.
- CVE-2018-1000838 — Critical (CVSS 10.0): autopsy version <= 4.9.0 contains a XML External Entity (XXE) vulnerability in CaseMetadata XML Parser that can result…
- CVE-2018-1000837 — Critical (CVSS 10.0): UML Designer version <= 8.0.0 contains a XML External Entity (XXE) vulnerability in XML parser for plugins that can…
- CVE-2018-1000835 — Critical (CVSS 10.0): KeePassDX version <= 2.5.0.0beta17 contains a XML External Entity (XXE) vulnerability in kdbx file parser that can…
Browse all CWE-611 (Improper Restriction of XML External Entity Reference (XXE)) vulnerabilities →