CVE-2021-25634: debian debian_linux Improper Certificate Validation
Vulnerability summary
CVE-2021-25634 is a high (CVSS 7.5) Improper Certificate Validation vulnerability in debian debian_linux. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 4 · Related 1Timeline
- 12-10-2021PublishedVulnerability first disclosed.
- 17-09-2024Last 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 modify a digitally signed ODF document to insert an additional signing time timestamp which LibreOffice would incorrectly present as a valid signature signed at the bogus signing time. 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
0.71%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
0.00 pp
From 0.71% 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-2021-25634X Refsource MISCREPORTVendor Advisory
