CVE-2021-25633: debian debian_linux Improper Certificate Validation
Vulnerability summary
CVE-2021-25633 is a high (CVSS 7.5) Improper Certificate Validation vulnerability in debian debian_linux. EPSS estimates a 0.73% chance of exploitation in the next 30 days, higher than 53.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 4 · Related 1Timeline
- 11-10-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
Description
LibreOffice supports digital signatures of ODF documents and macros within documents, presenting visual aids that no alteration of the document occurred since the last signing and that the signature is valid. An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to create a digitally signed ODF document, by manipulating the documentsignatures.xml or macrosignatures.xml stream within the document to combine multiple certificate data, which when opened caused LibreOffice to display a validly signed indicator but whose content was unrelated to the signature shown. This issue affects: The Document Foundation LibreOffice 7-0 versions prior to 7.0.6; 7-1 versions prior to 7.1.2.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
0.73%
Chance of exploitation in the next 30 days
Percentile
54%
Versus all other CVEs
30-day change
0.00 pp
From 0.73% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- libreoffice< 1:7.2.0-2
- debian_linuxEOL11.0
Libreoffice1 product
- libreoffice≥ 7.0.0, < 7.0.6 | ≥ 7.1.0, < 7.1.2
The document foundation1 product
- libreoffice≥ 7-0, < 7.0.6 | ≥ 7-1, < 7.1.2
Ubuntu1 product
- libreoffice< 1:6.4.7-0ubuntu0.20.04.2
4 vendors · 5 products
References
7 links- www.libreoffice.org/about-us/security/advisories/CVE-2021-25633X Refsource MISCREPORTVendor Advisory
