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FedoraOperating system · Fedoraproject

CVE-2015-7201

HIGH · 10.0 CVSS v2.0 Published 2015-12-16
Fix available
A fix is available. Upgrade to after 42.0 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
Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 43.0 and Firefox ESR 38.x before 38.5 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unknown 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 · high confidence

Memory corruption vulnerabilities in Mozilla Firefox's browser engine (likely SpiderMonkey/Gecko) affecting versions before 43.0 and ESR before 38.5. Multiple unspecified vectors allow remote attackers to trigger memory corruption leading to denial of service or potential arbitrary code execution.

MitigationUpdate Firefox to version 43.0 or later, or Firefox ESR to 38.5 or later. This is a client-side browser vulnerability with no effective network-level mitigation.

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
FedoraOperating system
Affected:= 22= 23
FirefoxWeb browser
Affected:<= 42.0= 38.0= 38.0.1= 38.0.5= 38.1.0= 38.1.1= 38.2.0= 38.2.1= 38.3.0= 38.4.0
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
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. Determine installed Firefox version
    Open Firefox, click the menu button (three horizontal lines), select Help, then About Firefox. Alternatively, type 'about:support' in the address bar and look for the version number in the Application Basics section.
    Affected if The displayed version is 42.0 or lower, or matches any of these specific versions: 38.0, 38.0.1, 38.0.5, 38.1.0, 38.1.1, 38.2.0, 38.2.1, 38.3.0, or 38.4.0
  2. Confirm Firefox edition type
    Check whether you are running Firefox Standard or Firefox ESR (Extended Support Release). In 'about:support', look for the 'Build Configuration' section or the version string for 'ESR' designation.
    Affected if Running Firefox ESR version 38.4.0 or lower (versions before 38.5)
  3. Verify Linux distribution package version (if applicable)
    On Fedora, run 'rpm -qa | grep firefox'. On openSUSE, run 'rpm -qa | grep -i firefox' to check the installed package version.
    Affected if The package version corresponds to Firefox 42.0 or lower, or matches the vulnerable 38.x versions listed, on Fedora 22/23 or openSUSE 13.1/13.2 or Leap 42.1

You are affected if you are running any Firefox version 42.0 or below, or ESR 38.4.0 or below, and you browse the web (the vulnerability triggers when visiting malicious web pages).

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 42.0
Interim mitigation

Update Firefox to version 43.0 or later, or Firefox ESR to 38.5 or later. This is a client-side browser vulnerability with no effective network-level mitigation.

Recommended fix High confidence

Firefox 43.0 or Firefox ESR 38.5

  1. 1. Back up any critical browser data (bookmarks, saved passwords, extensions) to prevent data loss during upgrade.
  2. 2. Update the system package repository to ensure access to the latest packages.
  3. 3. For Fedora systems: run 'dnf update firefox' or 'dnf upgrade firefox' to install the fixed version.
  4. 4. For openSUSE systems: run 'zypper update firefox' or 'zypper patch' to apply security updates.
  5. 5. After upgrading, verify the Firefox version by navigating to 'about:firefox' or checking Help > About Firefox to confirm version 43.0 or later (or ESR 38.5 or later for ESR users).
  6. 6. Restart the browser completely to ensure all components are updated.
  7. 7. Test that critical browser functionality works normally after the upgrade.
Caveat Upgrading Firefox may cause incompatibility with older extensions or add-ons that have not been updated for the new version; users should check extension compatibility.

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

Fix this in Fedora Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing1.0 h
  • Review / QA1.0 h
4.0 hours of engineering $750
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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-2015-7201 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