CVE-2025-2021
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 · uneditedAshlar-Vellum Cobalt XE File Parsing Integer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of XE files. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-25264.
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 confidenceThis is an integer overflow vulnerability in Ashlar-Vellum Cobalt XE's XE file parser. The application fails to properly validate user-supplied data during file parsing, leading to an integer overflow that can be weaponized to write beyond intended memory boundaries. Successful exploitation allows arbitrary code execution in the context of the current process, requiring the victim to open a specially crafted malicious XE file.
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= 12.0.1204.91CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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 installed Ashlar Cobalt versionOpen the application and navigate to Help > About, or check Add/Remove Programs (Programs and Features) for Ashlar Cobalt. The version is typically displayed as a four-part number.Affected if Version is 12.0.1204.91 exactly (this is the only affected version)
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Confirm XE file parser is presentLocate the Ashlar Cobalt installation directory (commonly C:\Program Files\Ashlar or C:\Program Files (x86)\Ashlar). Look for the main executable (Cobalt.exe or similar) and verify the application can open .XE files through File > Open.Affected if The application executable exists and supports XE file import functionality
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Check for recent XE file activityReview recent documents or file access logs for .XE files opened in Ashlar Cobalt. On Windows, check the application recent files list or Windows Jump List for .XE file entries.Affected if Suspicious or untrusted XE files were recently opened by the application
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Inspect application crash logsCheck the Ashlar Cobalt application data folder (typically %APPDATA%\Ashlar\Cobalt) and Windows Event Viewer for application crash events or error logs related to XE file parsing.Affected if Crash logs indicate failures during XE file processing with memory corruption indicators
You are affected if Ashlar Cobalt version 12.0.1204.91 is installed and the application processes XE files, since the integer overflow vulnerability triggers when parsing a specially crafted XE file.
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 dataUsers should avoid opening XE files from untrusted sources; apply vendor patches when available. Organizations should consider restricting file import functionality or running the application in sandboxed environments until a patch is released.
- Consultation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-2021 — 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-2025-2021 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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