It is possible for an attacker to manipulate the timestamp of signed documents. All versions of Apache OpenOffice up to 4.1.10 are affected. Users are advised to update to version 4.1.11. See CVE-2021-25634 for the LibreOffice advisory.
https://lists.apache.org/thread.html/rc5c277cb83e335696657c5f27da1d1e2b5cb48346b0b55415a233757%40%3Cannounce.apache.org%3E
https://lists.apache.org/thread.html/ra74d5057cdc781a36286a83e8bcbc90a7678f030ae73339c35dfc4f9%40%3Cusers.openoffice.apache.org%3E
https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-28832
Source: Mitre, NVD
Published: 2021-10-11
Updated: 2026-06-17
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 5.3
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS: 0.01502