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Released: Apache OpenOffice 4.1.15


Apache OpenOffice Advisory

#4 Content Manipulation with Certificate Validation Attack

Fixed in Apache OpenOffice 4.1.11


It is possible for an attacker to manipulate documents to appear to be signed by a trusted source.
An attacker can use the vulnerability to convert an untrusted digital signature into trusted ones and change the content of the ODF document without invalidating the signature.

Severity: Moderate

There are no known exploits of this vulnerability.
A proof-of-concept demonstration exists.

Thanks to the reporter for discovering this issue.

Vendor: The Apache Software Foundation

Versions Affected

All Apache OpenOffice versions 4.1.10 and older are affected. versions may also be affected.


Install Apache OpenOffice 4.1.11 for the latest maintenance and cumulative security fixes. Use the Apache OpenOffice download page.


The Apache OpenOffice Security Team would like to thank Simon Rohlmann, Vladislav Mladenov, Christian Mainka and Jörg Schwenk, Ruhr University Bochum, Germany, for discovering and reporting this attack vector.

Further Information

This issue was also reported to LibreOffice with CVE-2021-25635.

For additional information and assistance, consult the Apache OpenOffice Community Forums or make requests to the public mailing list.

The latest information on Apache OpenOffice security bulletins can be found at the Bulletin Archive page.

Security Home-> Bulletin-> CVE-2021-41832

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