OpenofficeApplication · Apache
CVE-2021-41830
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIt is possible for an attacker to manipulate signed documents and macros to appear to come from a trusted source. All versions of Apache OpenOffice up to 4.1.10 are affected. Users are advised to update to version 4.1.11. See CVE-2021-25633 for the LibreOffice advisory.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceApache OpenOffice contains a signature validation vulnerability that allows attackers to manipulate signed documents and macros to bypass authentication checks, causing them to appear as originating from a trusted source. This is a signature spoofing flaw in the document signing verification mechanism.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
OpenofficeApplication
< 4.1.11CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Apache OpenOffice installationCheck if Apache OpenOffice is installed on the system by looking for the application in the program files directory or by running 'soffice --version' in the command lineAffected if Apache OpenOffice is present on the system
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Identify installed versionRun 'soffice --version' or check the application 'About' dialog to obtain the exact version number installedAffected if The installed version is lower than 4.1.11 (e.g., 4.1.10 or earlier)
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Determine if signed documents are usedReview documents and macro files in use to identify if they contain digital signatures or are configured to use digital signaturesAffected if The user works with digitally signed documents or macros in Apache OpenOffice
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Inspect signature validation behaviorOpen a signed document in Apache OpenOffice and verify whether the signature validation correctly identifies the signer and detects modifications to signed contentAffected if Signatures on documents appear valid even after the document has been modified, or signature information shows unexpected origins
A user is affected if Apache OpenOffice version 4.1.10 or earlier is installed and they work with digitally signed documents or macros, as the signature spoofing vulnerability allows forged signatures to appear legitimate.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.1.11
Update Apache OpenOffice to version 4.1.11 or later to remediate the signature spoofing vulnerability.
Apache OpenOffice 4.1.11
- Navigate to the official Apache OpenOffice download page at https://www.openoffice.org/download/
- Download Apache OpenOffice version 4.1.11 for your operating system
- Close any running OpenOffice applications
- Run the installer and follow the prompts to install version 4.1.11
- Alternatively, if using a package manager, update the openoffice package to version 4.1.11
- After installation, verify the version by opening OpenOffice and checking Help > About Apache OpenOffice
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Openoffice
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,744.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-41830 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-41830 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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