CVE-2017-14271
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!RtlImpersonateSelfEx+0x000000000000024e."
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 confidenceXnView Classic v2.40 contains a memory corruption vulnerability when parsing specially crafted JB2 (JBIG2) image files. The vulnerability triggers a user-mode write access violation in ntdll.dll, indicating a buffer overflow or out-of-bounds write during JB2 file parsing. This can be exploited to achieve arbitrary code execution by crafting a malicious JB2 file that overwrites return addresses or function pointers on the stack.
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 is installedCheck for XnView.exe in typical installation directories such as C:\Program Files\XnView\ or C:\Program Files (x86)\XnView\, or search for the executable using the system search function.Affected if XnView Classic is found on the system
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Determine the installed version of XnView ClassicRight-click on XnView.exe, select Properties, and view the Version tab. Alternatively, open XnView and navigate to Help > About to see the version number.Affected if The version displayed is exactly 2.40
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Confirm JB2 file handling capabilityAttempt to open a legitimate .jb2 or .jbig2 file in XnView Classic to verify the program can process this image format.Affected if XnView Classic successfully opens and displays JB2 images
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Check if vulnerable JB2 parsing is reachableThe vulnerability triggers when parsing JB2 files - no special configuration is required beyond having the ability to open image files in XnView Classic.Affected if XnView Classic version 2.40 can open and parse JB2 image files
A user is affected if XnView Classic version 2.40 is installed and the program is used to open specially crafted JB2 (JBIG2) image files, which triggers the memory corruption vulnerability.
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 dataUpdate XnView Classic to a version that addresses this vulnerability. Until then, avoid opening untrusted .jb2 files and consider using alternative image viewers for JBIG2 format files. Deploy endpoint protection with behavioral detection to block file-based exploits.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2017-14271 — 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-2017-14271 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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