Content Manipulation with Certificate Validation Attack

published 2021-10-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-28833

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

It is possible for an attacker to manipulate documents to appear to be signed by a trusted source. All versions of Apache OpenOffice up to 4.1.10 are affected. Users are advised to update to version 4.1.11. See CVE-2021-25635 for the LibreOffice advisory.

Patch / fix

fixed in 1

apache openoffice 4.1.11

Exploit prediction

1.34% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

Apache Software Foundation Apache OpenOffice

Classification

Weakness

CWE-347 Improper Verification of Cryptographic Signature

References

lists.apache.org /thread.html/rd3214a568b43dd335b5d558f521377f4bff750684dea18eb041fc1bb%40%3Cusers.openoffice.apache.org%3E
mailing-list, vendor-advisory
lists.apache.org /thread.html/rfbc93cd7cea40e2ad3b6e080f688dd02566cdd2b1984fcbb6f8b0fb6%40%3Cannounce.apache.org%3E
mailing-list

Sources

CVE List CVE-2021-41832
NVD CVE-2021-41832

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary