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Ubuntu LinuxOperating system · Canonical

CVE-2015-4480

HIGH · 9.3 CVSS v2.0 Published 2015-08-16
Fix available
A fix is available. Upgrade to after 39.0.3 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
Integer overflow in the stagefright::SampleTable::isValid function in libstagefright in Mozilla Firefox before 40.0 and Firefox ESR 38.x before 38.2 allows remote attackers to execute arbitrary code via crafted MPEG-4 video data with H.264 encoding.

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

Integer overflow vulnerability in the stagefright::SampleTable::isValid function within libstagefright media library used by Mozilla Firefox. The flaw allows specially crafted MPEG-4 video data with H.264 encoding to trigger the overflow, leading to arbitrary code execution.

MitigationUpdate Mozilla Firefox to version 40.0 or later (or Firefox ESR 38.2 or later) to patch the integer overflow in the libstagefright library.

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
Ubuntu LinuxOperating system
Affected:= 12.04= 14.04= 15.04
FirefoxWeb browser
Affected:<= 39.0.3= 38.0= 38.0.1= 38.0.5= 38.1.0
OpensuseOperating system
Affected:= 13.1= 13.2

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. Check installed Firefox version
    Run 'firefox --version' or go to Firefox > Help > About to see the version number
    Affected if Version is 38.0, 38.0.1, 38.0.5, 38.1.0, or any version <= 39.0.3
  2. Confirm H.264 MPEG-4 video playback capability
    In Firefox, go to 'about:config' and verify 'media.mediasource.enabled' and 'media.webm.enabled' are set, or check if H.264 support is reported in 'about:support' under Media codec information
    Affected if Firefox has H.264 decoding capability enabled (via libstagefright or other backend)

A user is affected if they run Firefox version 38.x or <= 39.0.3 with the libstagefright backend enabled and have the capability to decode H.264 MPEG-4 video, making them vulnerable to specially crafted video 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 39.0.3
Interim mitigation

Update Mozilla Firefox to version 40.0 or later (or Firefox ESR 38.2 or later) to patch the integer overflow in the libstagefright library.

Recommended fix High confidence

Firefox 40.0 or Firefox ESR 38.2

  1. Check the current installed Firefox version
  2. Upgrade Firefox to version 40.0 (or Firefox ESR 38.2 for ESR installations)
  3. Restart Firefox after the upgrade

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

Fix this in Ubuntu Linux Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
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Scan for this in your stack

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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-2015-4480 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