Vulnerability in Libreoffice
CVE-2021-25633
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.
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (52.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Libreoffice
- The Document Foundation Libreoffice — versions 7-0, 7-1
- Debian Linux — versions 11.0
Weakness classification (CWE)
References
- www.libreoffice.org/about-us/security/advisories/CVE-2021-25633 (Vendor Advisory)
- www.debian.org/security/2021/dsa-4988 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-25633?
- CVE-2021-25633 is a high-severity vulnerability in Libreoffice, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2021-10-11.
- How severe is CVE-2021-25633?
- High severity. CVSS v3 base score is 7.5 out of 10.