Home/CVE/An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to self sign an ODF document, with
CVE

CVE-2021-25635

An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to self sign an ODF document, with

An Improper Certificate Validation vulnerability in LibreOffice allowed an attacker to self sign an ODF document, with a signature untrusted by the target, then modify it to change the signature algorithm to an invalid (or unknown to LibreOffice) algorithm and LibreOffice would incorrectly present such a signature with an unknown algorithm as a valid signature issued by a trusted person This issue affects LibreOffice: from 7.0 before 7.0.5, from 7.1 before 7.1.1.

MEDIUM · CVSS 5.5 EPSS 0.00045
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-295Improper Certificate Validation
▤

Affected Products & Versions

2
libreoffice>= 7.0.0 and < 7.0.5.1
libreoffice>= 7.1.0.0 and <= 7.1.1.1
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · security@documentfoundation.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD21 Mar 2025 · 03:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
rhsaRHSA-2022:1766Moderate
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.libreoffice.org/about-us/security/advisories/cve-2021-25635/Vendor Advisory
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