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FirefoxWeb browser · Mozilla

CVE-2013-0763

HIGH · 9.3 CVSS v2.0 Published 2013-01-13
Fix available
A fix is available. Upgrade to 2.15 / 10.0.12 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
Use-after-free vulnerability in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.1, Thunderbird before 17.0.2, Thunderbird ESR 17.x before 17.0.1, and SeaMonkey before 2.15 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via vectors related to Mesa drivers and a resized WebGL canvas.

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 use-after-free vulnerability in Mozilla products allows remote attackers to execute arbitrary code through corrupted heap memory. The flaw exists in the WebGL implementation when interacting with Mesa drivers during canvas resizing operations, causing freed memory to be accessed after deallocation.

MitigationUpgrade affected Mozilla products (Firefox, Firefox ESR, Thunderbird, Thunderbird ESR, SeaMonkey) to the patched versions specified in the advisory (18.0+, 17.0.1+, 17.0.2+) to remediate the vulnerability.

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:< 18.0>= 10.0, < 10.0.12>= 17.0, < 17.0.2
Enterprise Linux DesktopOperating system
Affected:= 5.0= 6.0
Enterprise Linux EusOperating system
Affected:= 5.9= 6.3
Enterprise Linux ServerOperating system
Affected:= 5.0= 6.0
Enterprise Linux Server AusOperating system
Affected:= 5.9
Enterprise Linux WorkstationOperating system
Affected:= 5.0= 6.0
Ubuntu LinuxOperating system
Affected:= 10.04= 11.10= 12.04= 12.10
SeamonkeyApplication
Affected:< 2.15

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 Help > About Firefox to view the exact version number
    Affected if Version is < 10.0.12, or >= 10.0 and < 17.0.2, or >= 17.0 and < 17.0.2, or < 18.0 (specifically < 18.0)
  2. Check installed SeaMonkey version
    Run 'seamonkey --version' or check the application properties
    Affected if Version is < 2.15
  3. Verify WebGL is enabled in the browser
    In Firefox, type 'about:config' in the address bar, search for 'webgl.enabled-for-all-sites' and check if it is set to true
    Affected if WebGL is enabled and the browser version falls within the affected ranges
  4. Check Red Hat Enterprise Linux version (if applicable)
    Run 'cat /etc/redhat-release' to identify the RHEL version
    Affected if Running RHEL Desktop 5.0, 6.0; RHEL Server 5.0, 6.0; RHEL Workstation 5.0, 6.0; RHEL EUS 5.9, 6.3; or RHEL Server Aus 5.9 with vulnerable Mozilla products installed
  5. Check Ubuntu Linux version (if applicable)
    Run 'cat /etc/lsb-release' to identify the Ubuntu version
    Affected if Running Ubuntu 10.04, 11.10, 12.04, or 12.10 with vulnerable Mozilla products installed

You are affected if you are running any Firefox version < 18.0 (specifically 10.0.x before 10.0.12, or 17.x before 17.0.2), SeaMonkey version < 2.15, or any Mozilla product on the listed RHEL/Ubuntu versions, AND WebGL is enabled in the browser.

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 2.15 / 10.0.12 / 17.0.2 or later
Fixed in 2.1510.0.1217.0.2
Interim mitigation

Upgrade affected Mozilla products (Firefox, Firefox ESR, Thunderbird, Thunderbird ESR, SeaMonkey) to the patched versions specified in the advisory (18.0+, 17.0.1+, 17.0.2+) to remediate the vulnerability.

Recommended fix High confidence

Firefox 18.0 or later (or Firefox ESR 17.0.1+); SeaMonkey 2.15 or later; Ubuntu 12.10 to later stable Ubuntu release

  1. 1. Identify the installed Mozilla product (Firefox, SeaMonkey, or Thunderbird) and current version using: 'firefox --version', 'seamonkey --version', or 'thunderbird --version'
  2. 2. For Firefox users: Upgrade to Firefox 18.0 or later. Download from https://www.mozilla.org/firefox/ or use system package manager
  3. 3. For Firefox ESR users: Upgrade to Firefox ESR 17.0.1 or later
  4. 4. For SeaMonkey users: Upgrade to SeaMonkey 2.15 or later. Download from https://www.seamonkey-project.org/
  5. 5. For Thunderbird users: Upgrade to Thunderbird 17.0.2 or later (if applicable)
  6. 6. After upgrade, verify the new version is installed by running the version command again
  7. 7. Restart the browser application completely to ensure the patched version is running
Caveat Minor: Upgrading to a new major version may change UI or add features that require user adjustment. Ensure compatibility with any required browser extensions.

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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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-2013-0763 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