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FirefoxWeb browser · Mozilla

CVE-2015-2724

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
Multiple unspecified vulnerabilities in the browser engine in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, and Thunderbird before 38.1 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

Multiple memory corruption vulnerabilities in Mozilla's Gecko browser engine allow remote attackers to crash the application or potentially execute arbitrary code via unspecified vectors. This affects Firefox ESR 31.x before 31.8 and 38.x before 38.1, Firefox before 39.0, and Thunderbird before 38.1.

MitigationUpgrade affected installations to Firefox 39.0+, Firefox ESR 31.8+/38.1+, or Thunderbird 38.1+ respectively. In enterprise environments, deploy updates via patch management systems and verify compliance.

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
SolarisOperating system
Affected:= 11.3
Suse Linux Enterprise Software Development KitApplication
Affected:= 12.0
Suse Linux Enterprise DesktopOperating system
Affected:= 12.0
Suse Linux Enterprise ServerOperating system
Affected:= 11= 12.0

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. Check Firefox version
    Run 'firefox --version' from command line, or on Windows check Help > About Firefox. On macOS, run 'Firefox > About Firefox'
    Affected if Version is 31.x or 38.x through 38.1.0 (all versions before 39.0 are affected)
  2. Check Firefox ESR version
    Run 'firefox --version' and look for 'ESR' in the version string, or check Help > About Firefox which displays ESR status
    Affected if Version is any 31.x before 31.8 (such as 31.1, 31.2, 31.3, 31.4, 31.5, 31.6.0, 31.7.0)
  3. Check Thunderbird version
    Run 'thunderbird --version' from command line, or on Windows/macOS check Help > About Thunderbird
    Affected if Version is any release before 38.1 (including 31.x through 38.0 releases)
  4. Check installed package versions on Linux
    Use 'dpkg -l | grep -i firefox' or 'rpm -qa | grep -i firefox' for RHEL/SUSE systems. On Ubuntu/Debian also check 'apt list --installed | grep -i firefox'
    Affected if Package version matches the affected version ranges listed for your distribution (12.04, 14.04, 14.10, 15.04 for Ubuntu; 7.0, 8.0 for Debian)
  5. Verify Gecko engine version if available
    In Firefox, type 'about:config' in address bar and search for 'app.buildID' or 'toolkit.defaultChromeURI' to view build information, or check the executable file properties
    Affected if The underlying Gecko engine version corresponds to Firefox 31.x through 38.1.0 releases

Your environment is affected if Firefox, Firefox ESR, or Thunderbird is installed at any version from 31.x through 38.1.0 (or before 38.1 for Thunderbird), or if your Ubuntu/Debian system has the vulnerable package versions installed.

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 affected installations to Firefox 39.0+, Firefox ESR 31.8+/38.1+, or Thunderbird 38.1+ respectively. In enterprise environments, deploy updates via patch management systems and verify compliance.

Recommended fix High confidence

Firefox 39.0 (or Firefox ESR 31.8 / Firefox ESR 38.1 depending on ESR track)

  1. Check current Firefox version by navigating to about:firefox in the address bar or running 'firefox --version' in terminal
  2. Back up the Firefox profile directory (typically ~/.mozilla/firefox) to preserve bookmarks, passwords, and settings
  3. Download Firefox 39.0 from the official Mozilla website (https://www.mozilla.org/firefox/download/)
  4. Install the new Firefox version using the downloaded installer
  5. For ESR users: If using Firefox ESR 31.x, upgrade to Firefox ESR 31.8; if using Firefox ESR 38.x, upgrade to Firefox ESR 38.1
  6. After installation, restart Firefox and verify the version in about:firefox
Caveat Standard security upgrade; verify critical add-ons are compatible with new version

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-2015-2724 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