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Firefox MobileWeb browser · Mozilla

CVE-2012-1135

HIGH · 9.3 CVSS v2.0 Published 2012-04-25
Fix available
A fix is available. Upgrade to after 10.0.3 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
FreeType before 2.4.9, as used in Mozilla Firefox Mobile before 10.0.4 and other products, allows remote attackers to cause a denial of service (invalid heap read operation and memory corruption) or possibly execute arbitrary code via vectors involving the NPUSHB and NPUSHW instructions in a TrueType font.

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 confidence

Heap-based memory corruption vulnerability in FreeType's TrueType font parser when handling NPUSHB and NPUSHW instructions allows remote code execution via specially crafted malicious font files.

MitigationUpdate FreeType to version 2.4.9 or later, and update affected Firefox versions to 10.0.4 or later. Sanitize or restrict loading of fonts from untrusted sources until patches are applied.

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
Firefox MobileWeb browser
Affected:<= 10.0.3= 1.0= 4.0= 5.0= 6.0= 6.0.1= 6.0.2= 7.0= 8.0= 9.0= 10.0= 10.0.1
FreetypeApplication
Affected:<= 2.4.8= 1.3.1= 2.0.0= 2.0.1= 2.0.2= 2.0.3= 2.0.4= 2.0.5= 2.0.6= 2.0.7= 2.0.8= 2.0.9

CVSS 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
M
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:M/Au:N/C:C/I:C/A:C

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify FreeType library version
    On Linux: run `freetype-config --version` or check `/usr/include/freetype/freetype.h` for FREETYPE_VERSION. On Windows: right-click freetype.dll, view Properties, check Version tab.
    Affected if version is 2.0.0 through 2.4.8, or 1.3.1, or any version <= 2.4.8
  2. Identify Firefox Mobile version
    Open Firefox Mobile, tap Menu, go to Settings, tap About Firefox. The version number is displayed.
    Affected if version is 1.0, 4.0, 5.0, 6.0, 6.0.1, 6.0.2, 7.0, 8.0, 9.0, 10.0, 10.0.1, or any version <= 10.0.3
  3. Confirm TrueType font parsing is active
    Check if the application loads or renders any TrueType fonts. On Firefox Mobile, visit a webpage that uses custom TrueType fonts (check network traffic for .ttf files).
    Affected if TrueType fonts can be loaded and parsed by the vulnerable component

You are affected if you have FreeType <= 2.4.8 or Firefox Mobile <= 10.0.3 AND the system processes or renders TrueType font files.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to a release after 10.0.3
Interim mitigation

Update FreeType to version 2.4.9 or later, and update affected Firefox versions to 10.0.4 or later. Sanitize or restrict loading of fonts from untrusted sources until patches are applied.

Recommended fix High confidence

FreeType 2.4.9+ and Firefox Mobile 10.0.4+

  1. Identify the FreeType library version in use by examining the application's dependencies
  2. If FreeType <= 2.4.8 is in use, upgrade to FreeType 2.4.9 or later
  3. If Firefox Mobile <= 10.0.3 is in use, upgrade to Firefox Mobile 10.0.4 or later
  4. Verify the upgrade by checking the library version with tools like 'freetype-config --version' or reviewing application metadata
Caveat Minor version upgrades of font rendering libraries typically have no breaking changes; they primarily contain security fixes

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Mobile Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing10.0 h
  • Review / QA5.0 h
33.0 hours of engineering $5,760
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Scan for this in your stack

Free · runs locally
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2012-1135 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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
  • No spam, self-promotion, credentials, or personal data