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    CVE-2021-40439

    Apache OpenOffice has a dependency on expat software. Versions prior to 2.1.0 were subject to CVE-2013-0340 a "Billion Laughs" entity expansion denial of service attack and exploit via crafted XML files. ODF files consist of a set of XML files. All versions of Apache OpenOffice up to 4.1.10 are subject to this issue. expat in version 4.1.11 is patched.

    Published:Oct 7, 2021
    Last Modified:Nov 21, 2024
    EPS:Oct 7, 2021
    EPSS Score:0.00289
    CVSS Score:6.5

    Affected Products

    Vendor
    Apache
    Product
    Openoffice

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-221 Data Serialization External Entities Blowup

    Related CVEs

    CVE-2025-64407 (CVSS 5.3) — Apache OpenOffice documents can contain links. A missing Authorization vulnerability in Apache OpenOffice allo…
    CVE-2025-64406 (CVSS 4.3) — An out-of-bounds Write vulnerability in Apache OpenOffice could allow an attacker to craft a document that wou…
    CVE-2025-64405 (CVSS 7.5) — Apache OpenOffice documents can contain links. A missing Authorization vulnerability in Apache OpenOffice allo…
    CVE-2025-64404 (CVSS 7.5) — Apache OpenOffice documents can contain links to other files. A missing Authorization vulnerability in Apache …
    CVE-2025-64403 (CVSS 8.1) — Apache OpenOffice Calc spreadsheet can contain links to other files, in the form of "external data sources". A…
    CVE-2025-64402 (CVSS 6.5) — Apache OpenOffice documents can contain links. A missing Authorization vulnerability in Apache OpenOffice allo…
    CVE-2025-64401 (CVSS 7.5) — Apache OpenOffice documents can contain links. A missing Authorization vulnerability in Apache OpenOffice allo…
    CVE-2023-47804 (CVSS 8.8) — Apache OpenOffice documents can contain links that call internal macros with arbitrary arguments. Several URI …
    CVE-2022-47502 (CVSS 7.8) — Apache OpenOffice documents can contain links that call internal macros with arbitrary arguments. Several URI …
    CVE-2022-38745 (CVSS 7.8) — Apache OpenOffice versions before 4.1.14 may be configured to add an empty entry to the Java class path. This …

    References

    http://www.openwall.com/lists/oss-security/2021/10/07/4
    https://lists.apache.org/thread.html/r41eca5f4f09e74436cbb05dec450fc2bef37b5d3e966aa7cc5fada6d%40%3Cannounce.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
    http://www.openwall.com/lists/oss-security/2021/10/07/4
    https://lists.apache.org/thread.html/r41eca5f4f09e74436cbb05dec450fc2bef37b5d3e966aa7cc5fada6d%40%3Cannounce.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
    https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High