CVE-2021-26612
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 · uneditedAn improper input validation leading to arbitrary file creation was discovered in copy method of Nexacro platform. Remote attackers use copy method to execute arbitrary command after the file creation included malicious code.
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 confidenceThe Nexacro platform contains an improper input validation vulnerability in its copy method that allows remote attackers to create arbitrary files on the system. By supplying malicious file names or paths, attackers can write files containing malicious code that enables arbitrary command execution.
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<= 17.1.2.500CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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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Identify Nexacro platform installation and versionLocate the Nexacro platform installation directory and check the version information file, typically found in the product's About or version manifest (e.g., version.txt, product.ini, or the main executable's file properties)Affected if The installed version is 17.1.2.500 or any lower version number in the 17.x line, or if the version cannot be determined but Nexacro platform is present
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Check for copy method usage in application codeSearch application source files and runtime configurations for usage of the copy method, particularly in Nexacro script files (*.js, *.xfdl, or Nexacro-specific script files) where file copy operations are performedAffected if The copy method is implemented and accessible within the application without proper input validation on file name or path parameters
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Identify web-accessible Nexacro endpointsReview web server configurations and application deployment descriptors to identify Nexacro-based web services or APIs that handle file operations and are exposed over HTTP/HTTPSAffected if Nexacro file operations including copy functionality are accessible via web-facing endpoints without additional access controls
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Verify input validation on file operationsExamine the application's file handling code paths, specifically around copy method calls, to determine whether file names and paths are validated against a whitelist or sanitized before being used in file system operationsAffected if No visible input validation, sanitization, or path restriction exists on the copy method parameters, allowing arbitrary file names or paths to be passed
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Check for untrusted file write permissionsReview file system permissions and application configuration to determine if the process running Nexacro has write access to directories outside of intended application data foldersAffected if The application has write permissions to system directories, web root, or other sensitive locations where arbitrary file creation could lead to command execution
You are affected if your Tobesoft Nexacro platform version is 17.1.2.500 or lower and the copy method with file operation functionality is accessible or used within your application without input validation controls.
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.
From vendor dataApply vendor patches or updates for Nexacro platform that address input validation in the copy method. If no patch is available, implement input sanitization and validation controls on the copy method to restrict file creation to allowed directories and validate file names against an allowlist.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-26612 — 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-2021-26612 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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