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FirefoxWeb browser · Mozilla

CVE-2015-2736

HIGH · 9.3 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
The nsZipArchive::BuildFileList function in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, and Thunderbird before 38.1 accesses unintended memory locations, which allows remote attackers to have an unspecified impact via a crafted ZIP archive.

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 memory corruption vulnerability exists in Mozilla's nsZipArchive::BuildFileList function which handles ZIP archive parsing. The function reads from unintended memory locations (out-of-bounds read) when processing a crafted ZIP archive, potentially allowing remote code execution or other unspecified impacts.

MitigationUpdate affected Mozilla products to the patched versions: Firefox 39.0+, Firefox ESR 31.8+, Firefox ESR 38.1+, or Thunderbird 38.1+.

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:<= 38.1.0= 31.0= 31.1.0= 31.1.1= 31.3.0= 31.5.1= 31.5.2= 31.5.3= 38.0
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
ThunderbirdApplication
Affected:<= 38.0.1
SolarisOperating system
Affected:= 11.3
Suse Linux Enterprise Software Development KitApplication
Affected:= 12.0
Suse Linux Enterprise DesktopOperating system
Affected:= 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
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 Firefox version
    Navigate to Firefox, click the menu icon, select Help, then About Firefox. Or run 'firefox --version' from command line.
    Affected if Version is 31.0, 31.1.0, 31.1.1, 31.3.0, 31.5.1, 31.5.2, 31.5.3, 38.0, or any version <= 38.1.0
  2. Check Firefox ESR version
    Navigate to Firefox ESR, click the menu icon, select Help, then About Firefox. Or run 'firefox --version' from command line.
    Affected if Version is 31.1, 31.2, 31.3, 31.4, 31.5, 31.6.0, or 31.7.0
  3. Check Thunderbird version
    Navigate to Thunderbird, click the menu icon, select Help, then About Thunderbird. Or run 'thunderbird --version' from command line.
    Affected if Version is any version <= 38.0.1
  4. Check installed Mozilla package version on Ubuntu/Debian
    Run 'dpkg -l | grep -i firefox' or 'dpkg -l | grep -i thunderbird' to list installed Mozilla packages and their versions.
    Affected if The installed Mozilla Firefox or Thunderbird package version matches the affected versions listed for the distribution.

A user is affected if they have Firefox version <= 38.1.0 (or specifically 31.x/38.0 variants), Firefox ESR 31.x through 31.7.0, or Thunderbird version <= 38.0.1 installed on any platform.

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

Update affected Mozilla products to the patched versions: Firefox 39.0+, Firefox ESR 31.8+, Firefox ESR 38.1+, or Thunderbird 38.1+.

Recommended fix High confidence

Firefox 39.0+; Firefox ESR 31.8+ or 38.1+; Thunderbird 38.1+

  1. 1. Back up any important browser data (bookmarks, passwords, extensions) before upgrading
  2. 2. For Firefox: Navigate to the official Mozilla Firefox download page or use your system's package manager to upgrade to Firefox 39.0 or later
  3. 3. For Firefox ESR: Upgrade to Firefox ESR 31.8 or later, or Firefox ESR 38.1 or later depending on your branch
  4. 4. For Thunderbird: Upgrade to Thunderbird 38.1 or later
  5. 5. On Linux systems (Ubuntu, Debian, SUSE): Use your distribution's package manager (apt-get, yum, zypper) to update the packages to the fixed versions
  6. 6. After upgrading, verify the version by navigating to Help > About Firefox/Thunderbird to confirm the installed version

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

Fix this in Firefox Scoped from the published advisory
  • Consultation3.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
20.0 hours of engineering $3,480
Get the upgrade done

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Scan for this in your stack

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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-2015-2736 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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