FirefoxWeb browser · Mozilla
CVE-2014-1580
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 · uneditedMozilla Firefox before 33.0 does not properly initialize memory for GIF images, which allows remote attackers to obtain sensitive information from process memory via a crafted web page that triggers a sequence of rendering operations for truncated GIF data within a CANVAS element.
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 confidenceFirefox before 33.0 contains a memory initialization flaw in its GIF image rendering engine. When processing truncated GIF data within a CANVAS element, uninitialized memory contents are exposed to the rendering pipeline, allowing attackers to read sensitive data from the process memory heap.
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
FirefoxWeb browser
<= 32.0= 30.0= 31.0= 31.1.0CVSS 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
- Network
- Complexity
- Low
- Authentication
- None
- Confidentiality
- Partial
- Integrity
- None
- Availability
- None
AV:N/AC:L/Au:N/C:P/I:N/A:N
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 Firefox versionNavigate to Firefox menu > Help > About Firefox, or enter 'about:support' in the address bar, or run 'firefox --version' from command lineAffected if Version is 30.0, 31.0, 31.1.0, or any version 32.0 or lower
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Determine if CANVAS element is used with external GIF contentSearch web application source code for '<canvas>' tags that load GIF images via drawImage() or similar CanvasRenderingContext2D methodsAffected if CANVAS element processes GIF images from untrusted sources such as user uploads, remote URLs, or third-party content
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Verify if GIF processing handles truncated or malformed dataReview application logic or server-side image handling to see if GIF files are validated for completeness before rendering in CANVASAffected if Application allows truncated, partial, or malformed GIF files to reach the CANVAS rendering pipeline without integrity validation
User is affected if running Firefox version 30.0, 31.0, 31.1.0, or 32.0 and the browser processes GIF images within CANVAS elements, especially from untrusted or potentially truncated sources.
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 dataUpgrade Mozilla Firefox to version 33.0 or later to obtain the patched image rendering code that properly initializes memory before GIF processing.
Fix this in Firefox
Scoped from the published advisory
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2014-1580 — 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-2014-1580 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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