Vulnerability in Libreoffice
CVE-2021-25636
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 contain both "X509Data" and "KeyValue" children of the "KeyInfo" tag, which when opened caused LibreOffice to verify using the "KeyValue" but to report verification with the unrelated "X509Data" value. This issue affects: The Document Foundation LibreOffice 7.2 versions prior to 7.2.5.
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: 0.010 (59.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 59.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Libreoffice
- The Document Foundation Libreoffice — versions 7.2
- Fedoraproject Fedora — versions 34
Weakness classification (CWE)
References
- www.libreoffice.org/about-us/security/advisories/CVE-2021-25636/ (Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2023/03/msg00022.html (mailing-list)
Frequently asked questions
- What is CVE-2021-25636?
- CVE-2021-25636 is a high-severity vulnerability in Libreoffice, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.5/10. Published 2022-02-24.
- How severe is CVE-2021-25636?
- High severity. CVSS v3 base score is 7.5 out of 10.