CVE-2018-11703
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 · uneditedFastStone Image Viewer 6.2 has a User Mode Write AV at 0x00402d6a, triggered when the user opens a malformed JPEG file that is mishandled by FSViewer.exe. Attackers could exploit this issue for DoS (Access Violation) or possibly unspecified other impact.
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 confidenceFastStone Image Viewer 6.2 contains a memory corruption vulnerability in its JPEG parsing routine. When processing a malformed JPEG file, the application attempts to write to an invalid memory address (0x00402d6a), resulting in a User Mode Access Violation. This indicates an out-of-bounds write vulnerability likely caused by insufficient bounds checking during JPEG image processing.
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= 6.2CVSS 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 FastStone Image Viewer versionLocate the FastStone Image Viewer installation (typically in Program Files or Program Files x86) and check the version via the application's About dialog, or inspect the executable's properties. Alternatively, check Add/Remove Programs or the version info of the main executable file.Affected if The installed version is exactly 6.2. Versions before or after 6.2 are not listed as affected in this CVE.
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Confirm JPEG file handling is accessibleVerify that the application can open and process JPEG image files. The vulnerability is triggered during JPEG parsing when a malformed JPEG file is opened.Affected if Users have the ability to open JPEG files using FastStone Image Viewer 6.2, as this is the code path that contains the vulnerable JPEG parsing routine.
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Assess user file opening capabilitiesDetermine whether users can open files from untrusted or external sources. This includes checking if users can attach or download JPEG files and open them with the application, or if file access is restricted through enterprise controls.Affected if Users can open arbitrary JPEG files (including potentially malformed ones) with FastStone Image Viewer 6.2, which would trigger the vulnerable code path.
Your environment is affected if FastStone Image Viewer version 6.2 is installed and users can open JPEG files with it, as the memory corruption vulnerability exists in the JPEG parsing routine.
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 patch if available; otherwise, implement compensating controls by restricting access to untrusted JPEG files and ensuring users cannot open files from untrusted sources.
- Consultation4.0 h
- Implementation8.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,880.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-11703 — 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-2018-11703 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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