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FirefoxWeb browser · Mozilla

CVE-2017-7845

HIGH · 8.8 CVSS v3.0 Published 2018-06-11
Fix available
A fix is available. Upgrade to 52.5.2 / 57.0.2 or later.
See remediation →
95/100
Remediation priority · Urgent
Remotely reachable No privileges

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
A buffer overflow occurs when drawing and validating elements using Direct 3D 9 with the ANGLE graphics library, used for WebGL content. This is due to an incorrect value being passed within the library during checks and results in a potentially exploitable crash. Note: This attack only affects Windows operating systems. Other operating systems are unaffected. This vulnerability affects Thunderbird < 52.5.2, Firefox ESR < 52.5.2, and Firefox < 57.0.2.

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

A buffer overflow vulnerability exists in the ANGLE graphics library (used for WebGL rendering via Direct3D 9) in Firefox and Thunderbird on Windows. An incorrect value is passed during validation checks when drawing elements, causing a buffer overflow that leads to a potentially exploitable crash.

MitigationUpdate affected software to patched versions: Firefox 57.0.2 or later, Firefox ESR 52.5.2 or later, or Thunderbird 52.5.2 or later. This vulnerability only affects Windows systems.

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:< 52.5.2< 57.0.2
ThunderbirdApplication
Affected:< 52.5.2

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
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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. Verify Windows platform
    Check if the system is running Windows. This vulnerability only affects Windows systems. Run 'systeminfo' or check system properties.
    Affected if System is not running Windows - the vulnerability does not affect other platforms
  2. Check if Firefox is installed
    Locate Firefox installation and determine version. Common paths: C:\Program Files\Mozilla Firefox\firefox.exe or C:\Program Files (x86)\Mozilla Firefox\firefox.exe. Run 'firefox --version' or check file properties.
    Affected if Firefox is installed and version is less than 52.5.2 OR between 52.5.2 and 57.0.2 (exclusive of 57.0.2)
  3. Check if Thunderbird is installed
    Locate Thunderbird installation and determine version. Common path: C:\Program Files\Mozilla Thunderbird\thunderbird.exe. Run 'thunderbird --version' or check file properties.
    Affected if Thunderbird is installed and version is less than 52.5.2
  4. Verify WebGL is enabled in Firefox
    In Firefox, type 'about:config' in the address bar, search for 'webgl.disabled' preference. Check its value - if set to false, WebGL is enabled.
    Affected if WebGL is enabled in Firefox (webgl.disabled is false) - the vulnerability requires WebGL to be active to be exploitable
  5. Confirm ANGLE Direct3D 9 rendering is in use
    In Firefox, type 'about:support' and look for 'WebGL Driver' information. Check if the renderer string includes 'ANGLE' or 'Direct3D9'. Alternatively, in about:config, check 'webgl.prefer-native-gl' is false and 'gl.patch-angle' is enabled by default.
    Affected if WebGL is using ANGLE with Direct3D 9 backend - the vulnerability exists specifically in this configuration

User is affected if running Windows with Firefox version < 52.5.2, Firefox 52.5.2-57.0.1, or Thunderbird version < 52.5.2, with WebGL enabled and using ANGLE Direct3D 9 rendering.

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.

From vendor data
Upgrade available Upgrade to 52.5.2 / 57.0.2 or later
Fixed in 52.5.257.0.2
Interim mitigation

Update affected software to patched versions: Firefox 57.0.2 or later, Firefox ESR 52.5.2 or later, or Thunderbird 52.5.2 or later. This vulnerability only affects Windows systems.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

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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-2017-7845 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