CVE-2017-14270
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 · uneditedXnView Classic for Windows Version 2.40 allows attackers to execute arbitrary code or cause a denial of service via a crafted .jb2 file, related to a "User Mode Write AV starting at ntdll_77400000!RtlFillMemoryUlong+0x0000000000000010."
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 confidenceXnView Classic Version 2.40 contains a memory corruption vulnerability in its JB2 image format parser. When parsing a specially crafted .jb2 file, the application triggers a user-mode write access violation at ntdll!RtlFillMemoryUlong, allowing attackers to potentially execute arbitrary code or cause a 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= 2.40CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:L/AC:L/PR:L/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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Verify XnView Classic installationLook for XnView in standard installation directories (C:\Program Files\XnView or C:\Program Files (x86)\XnView) and confirm xnview.exe existsAffected if XnView Classic version 2.40 is installed on the system
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Confirm the exact version numberRight-click on xnview.exe, select Properties, go to the Details tab, and note the File Version attributeAffected if The file version shows exactly 2.40, matching the affected version in this CVE
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Check if JB2 file support is enabledExamine the XnView program folder for JB2-related components (look for files containing 'jb2' in the filename) or verify .jb2 file type associations in WindowsAffected if JB2 image format support is enabled or associated with XnView
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Identify JB2 files in accessible locationsSearch the system for .jb2 files using File Explorer or the command line (for example: dir /s /b C:\*.jb2 or locate .jb2 in user directories)Affected if Untrusted .jb2 files exist on the system that could be opened by XnView
A system is affected if XnView Classic version 2.40 is installed, JB2 file support is active, and users can open untrusted .jb2 files with this application.
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 untrusted .jb2 files in XnView until a patch is available. Consider using alternative image viewers or disabling JB2 file type associations for untrusted sources.
- 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-2017-14270 — 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-2017-14270 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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