CVE-2018-1000821
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 · uneditedMicroMathematics version before commit 5c05ac8 contains a XML External Entity (XXE) vulnerability in SMathStudio files that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This attack appear to be exploitable via Specially crafted SMathStudio files. This vulnerability appears to have been fixed in after commit 5c05ac8.
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 · high confidenceMicroMathematics contains an XML External Entity (XXE) vulnerability in its SMathStudio file parsing functionality. By crafting malicious XML files with external entity references, an attacker can read local files, perform SSRF attacks, port scanning, or cause denial of service.
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< 2.17.3CVSS 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
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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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Verify MicroMathematics is installedCheck for the application in your system (common paths: Program Files on Windows, /Applications on macOS, or via package manager on Linux)Affected if The application is present on the system
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Determine installed versionRight-click the application and view properties, or run: 'apt list --installed | grep micromathematics' (Linux), check the application's About/Help sectionAffected if Version is lower than 2.17.3
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Check if SMathStudio file parsing is accessibleLook for file import or open functionality that handles .sm files, or check the application logs for XML parsing activityAffected if SMathStudio file import/parsing feature is available and user can load external files
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Verify XML parser configurationInspect application logs or XML processing behavior when loading a test .sm fileAffected if The application processes XML without disabling external entities and DTD processing
User is affected if MicroMathematics version is below 2.17.3 and the SMathStudio file parsing feature is accessible to load external XML files.
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 · scoped2.17.3
Update to a version after commit 5c05ac8, or if unable to update, disable external entity processing and DTD processing in the XML parser configuration.
MicroMathematics version 2.17.3 or any version newer than 2.17.3 (post-commit 5c05ac8)
- Check the current version of MicroMathematics installed (likely via app store, package manager, or application 'About' section
- Locate the official download source for MicroMathematics (typically from the developer's website or app store)
- Upgrade to MicroMathematics version 2.17.3 or later, which contains the fix for the XXE vulnerability
- After upgrading, verify the new version is running and test with SMathStudio files to confirm functionality
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,512.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-1000821 — 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-2018-1000821 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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- 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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