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FirefoxWeb browser · Mozilla

CVE-2015-2734

HIGH · 10.0 CVSS v2.0 Published 2015-07-06
Fix available
A fix is available. Upgrade to after 38.1.0 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
The CairoTextureClientD3D9::BorrowDrawTarget function in the Direct3D 9 implementation in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, and Thunderbird before 38.1 reads data from uninitialized memory locations, which has unspecified impact and attack vectors.

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 confidence

A memory disclosure vulnerability in Mozilla Firefox and Thunderbird's Direct3D 9 graphics rendering implementation allows the CairoTextureClientD3D9::BorrowDrawTarget function to read data from uninitialized memory locations, potentially exposing sensitive information or creating conditions for code execution.

MitigationUpgrade to Firefox 39.0+, Firefox ESR 31.8+/38.1+, or Thunderbird 38.1+ to patch the vulnerable Direct3D 9 texture handling code.

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
Affected:= 31.0= 31.1.0= 31.1.1= 31.3.0= 31.5.1= 31.5.2= 31.5.3= 38.0<= 38.1.0
Firefox EsrWeb browser
Affected:= 31.1= 31.2= 31.3= 31.4= 31.5= 31.6.0= 31.7.0
Ubuntu LinuxOperating system
Affected:= 12.04= 14.04= 14.10= 15.04
Debian LinuxOperating system
Affected:= 7.0= 8.0
Linux Enterprise DesktopOperating system
Affected:= 12
Linux Enterprise ServerOperating system
Affected:= 11
Linux Enterprise Software Development KitOperating system
Affected:= 12
Suse Linux Enterprise ServerOperating system
Affected:= 12

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
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/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 installed Mozilla product
    Check if Firefox or Thunderbird is installed. On Windows, look in Program Files. On Linux, check package manager (dpkg -l for Debian/Ubuntu, rpm -qa for SUSE).
    Affected if Neither Firefox nor Thunderbird is installed on the system
  2. Check Firefox version
    Run 'firefox --version' or look at About Firefox in the application menu. Record the exact version number.
    Affected if Firefox version is 31.0, 31.1.0, 31.1.1, 31.3.0, 31.5.1, 31.5.2, 31.5.3, 38.0, or any version through 38.1.0
  3. Check Firefox ESR version
    Run 'firefox --version' and look for 'ESR' designation. Record the exact version number.
    Affected if Firefox ESR version is 31.1, 31.2, 31.3, 31.4, 31.5, 31.6.0, or 31.7.0
  4. Check Thunderbird version
    Run 'thunderbird --version' or look at About Thunderbird in the application menu. Record the exact version number.
    Affected if Thunderbird version is any version through 38.0 (Thunderbird is also affected but specific versions not fully listed in provided data)
  5. Confirm Windows platform with Direct3D 9
    Verify the system is Windows (the Direct3D 9 rendering path is Windows-specific). Check that hardware acceleration is enabled in the browser (Options > Advanced > General > Use hardware acceleration).
    Affected if Running on a non-Windows platform (Linux builds do not use Direct3D 9)

User is affected if Firefox (version 31.0 through 38.1.0 or ESR 31.1 through 31.7.0) or Thunderbird is installed on Windows with hardware acceleration enabled, as the Direct3D 9 texture handling code path is only active under those conditions.

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 38.1.0
Interim mitigation

Upgrade to Firefox 39.0+, Firefox ESR 31.8+/38.1+, or Thunderbird 38.1+ to patch the vulnerable Direct3D 9 texture handling code.

Recommended fix High confidence

Firefox 39.0+ (or Firefox ESR 31.8+ / 38.1+), Thunderbird 38.1+

  1. 1. Back up any important browser data (bookmarks, passwords, extensions) or use Firefox Sync
  2. 2. Download Firefox 39.0 or later from the official Mozilla website (https://www.mozilla.org/firefox/)
  3. 3. For Firefox ESR users, upgrade to version 31.8 or later, or 38.1 or later
  4. 4. For Thunderbird users, upgrade to version 38.1 or later
  5. 5. Install the new version, replacing the vulnerable installation
  6. 6. Restart the browser/application after upgrade
  7. 7. Verify the installed version by checking Help > About Firefox/Thunderbird
Caveat Standard upgrade - ensure extension compatibility with new version; profile should be compatible

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
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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-2015-2734 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