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FirefoxWeb browser · Mozilla

CVE-2015-7207

MEDIUM · 5.0 CVSS v2.0 Published 2015-12-16
Fix available
A fix is available. Upgrade to after 42.0 or later.
See remediation →
59/100
Remediation priority · Elevated
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
Mozilla Firefox before 43.0 does not properly restrict the availability of IFRAME Resource Timing API times, which allows remote attackers to bypass the Same Origin Policy and obtain sensitive information via crafted JavaScript code that leverages history.back and performance.getEntries calls, a related issue to CVE-2015-1300.

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

Firefox before version 43.0 fails to properly restrict the Resource Timing API within IFRAMEs, allowing JavaScript code using history.back() and performance.getEntries() to bypass the Same Origin Policy and obtain sensitive timing information about cross-origin resources.

MitigationUpgrade Mozilla Firefox to version 43.0 or later, which contains the proper restriction of IFRAME Resource Timing API times.

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:<= 42.0
FedoraOperating system
Affected:= 22= 23
LeapOperating system
Affected:= 42.1
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
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None

AV:N/AC:L/Au:N/C:P/I:N/A:N

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. Determine installed Firefox version
    On Windows: Open Firefox, go to Help > About Firefox. On Linux: Run 'firefox --version' or 'rpm -q firefox'/'dpkg -l firefox' depending on package manager. On macOS: Run 'firefox --version' or check via Firefox > About Firefox.
    Affected if Version is 42.0 or lower (any version before 43.0)
  2. Check Firefox package version on Fedora
    Run 'rpm -q firefox' to query the installed Firefox package version.
    Affected if Package version is lower than firefox-43.0
  3. Check Firefox package version on openSUSE
    Run 'rpm -q firefox' or 'zypper se firefox' to query the installed package version.
    Affected if Package version is lower than the Firefox 43.0 packages for openSUSE 13.1, 13.2, or Leap 42.1

A user is affected if their Firefox browser version is 42.0 or lower, or if their Linux distribution ships a Firefox package version below 43.0.

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 a release after 42.0
Interim mitigation

Upgrade Mozilla Firefox to version 43.0 or later, which contains the proper restriction of IFRAME Resource Timing API times.

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

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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-2015-7207 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