CVE-2023-39943
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 · uneditedIn Ashlar-Vellum Cobalt versions prior to v12 SP2 Build (1204.200), the affected application lacks proper validation of user-supplied data when parsing XE files. This could lead to an out-of-bounds write. An attacker could leverage this vulnerability to execute arbitrary code in the context of the current process.
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 confidenceAshlar-Vellum Cobalt lacks proper validation of user-supplied data when parsing XE files, leading to an out-of-bounds write vulnerability. An attacker can exploit this by tricking a user into opening a malicious XE file, potentially achieving arbitrary code execution in the context of the current process.
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< 12.4.1204.200CVSS 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:3.1/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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Confirm Ashlar-Vellum Cobalt is installedLocate the Ashlar Cobalt application on the system - check Program Files for 'Ashlar-Vellum' or 'Ashlar Cobalt' directory, or search for cobalt.exeAffected if The application is present on the system
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Determine installed versionRight-click on the Cobalt executable (commonly cobalt.exe), select Properties, and check the Version tab for the product version; alternatively, launch Cobalt and check Help > About for the full version string including build numberAffected if Version number is less than 12.4.1204.200
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Verify XE file format supportAttempt to open a sample .XE file in Cobalt, or check file associations for .XE extension - the vulnerability triggers when the application parses XE file contentAffected if The application can open and parse XE files (this is the default behavior; XE is a native format for Ashlar Cobalt)
User is affected if Ashlar Cobalt is installed with a version prior to 12.4.1204.200 and the application can open XE files, since the vulnerability triggers upon parsing a malicious 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.
dbcve · scoped12.4.1204.200
Update to Ashlar-Vellum Cobalt v12 SP2 Build (1204.200) or later. Until patched, avoid opening XE files from untrusted sources.
Cobalt v12 SP2 Build 1204.200
- Download Cobalt v12 SP2 Build 1204.200 (or later) from the official Ashlar-Vellum website or authorized distributor
- Close all running instances of the Cobalt application
- Uninstall the current vulnerable version of Cobalt from the system
- Install the fixed version (v12 SP2 Build 1204.200 or later) using the downloaded installer
- Launch Cobalt and verify the version by checking Help > About to confirm the installed build number matches or exceeds 1204.200
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,040.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-39943 — 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-2023-39943 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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