What is CVE-2021-41831?

CVE-2021-41831 is a medium-severity vulnerability in Apache Openoffice, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2021-10-11.

How severe is CVE-2021-41831?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Apache Openoffice

CVE-2021-41831

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.

Published 2021-10-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.015 (73.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Apache Openoffice
Apache Software Foundation Openoffice — versions Apache OpenOffice, OpenOffice.org

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

lists.apache.org/thread.html/ra74d5057cdc781a36286a83e8bcbc90a7678f030ae73339c3… (Mailing List, Vendor Advisory)
lists.apache.org/thread.html/rc5c277cb83e335696657c5f27da1d1e2b5cb48346b0b55415… (mailing-list)

Frequently asked questions

What is CVE-2021-41831?: CVE-2021-41831 is a medium-severity vulnerability in Apache Openoffice, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2021-10-11.
How severe is CVE-2021-41831?: Medium severity. CVSS v3 base score is 5.3 out of 10.