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FirefoxWeb browser · Mozilla

CVE-2015-2713

MEDIUM · 6.8 CVSS v2.0 Published 2015-05-14
Fix available
A fix is available. Upgrade to after 37.0.2 or later.
See remediation →
77/100
Remediation priority · High
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
Use-after-free vulnerability in the SetBreaks function in Mozilla Firefox before 38.0, Firefox ESR 31.x before 31.7, and Thunderbird before 31.7 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via a document containing crafted text in conjunction with a Cascading Style Sheets (CSS) token sequence containing properties related to vertical text.

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 use-after-free vulnerability in the SetBreaks function in Mozilla Firefox and Thunderbird allows remote attackers to execute arbitrary code or cause heap memory corruption by tricking users into opening documents containing crafted text combined with CSS properties related to vertical text processing (such as writing-mode).

MitigationUpgrade to Firefox 38.0 or later, Firefox ESR 31.7 or later, or Thunderbird 31.7 or later to patch the vulnerability.

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:<= 37.0.2= 31.0= 31.1.0= 31.1.1= 31.3.0= 31.5.1= 31.5.2= 31.5.3
Firefox EsrWeb browser
Affected:= 31.1= 31.2= 31.3= 31.4= 31.5= 31.6.0
Suse Linux Enterprise Software Development KitApplication
Affected:= 12.0
Suse Linux Enterprise DesktopOperating system
Affected:= 12.0
Suse Linux Enterprise ServerOperating system
Affected:= 12.0
OpensuseOperating system
Affected:= 13.1= 13.2
ThunderbirdApplication
Affected:<= 31.5

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
Partial
Integrity
Partial
Availability
Partial

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

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
    In Firefox, go to Help > About Firefox, or navigate to about:support, or run firefox --version from command line
    Affected if The installed version is 37.0.2 or lower, or is exactly 31.0, 31.1.0, 31.1.1, 31.3.0, 31.5.1, 31.5.2, or 31.5.3
  2. Check Firefox ESR version
    In Firefox ESR, go to Help > About, or run firefox --version from command line
    Affected if The installed version is exactly 31.1, 31.2, 31.3, 31.4, 31.5, or 31.6.0
  3. Check Thunderbird version
    In Thunderbird, go to Help > About Thunderbird, or run thunderbird --version from command line
    Affected if The installed version is 31.5 or lower
  4. Verify vertical text CSS handling is accessible
    The vulnerability triggers when opening documents containing CSS writing-mode property for vertical text. This is a standard CSS feature enabled by default in affected browser versions. Check if the application processes HTML content with CSS.
    Affected if The vulnerable browser version is installed and can render HTML documents with CSS stylesheets (default behavior)

You are affected if you have Firefox <=37.0.2, Firefox ESR 31.1-31.6.0, or Thunderbird <=31.5 installed and the application processes HTML documents with vertical text CSS features (writing-mode), which is default behavior.

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 37.0.2
Interim mitigation

Upgrade to Firefox 38.0 or later, Firefox ESR 31.7 or later, or Thunderbird 31.7 or later to patch the vulnerability.

Fix this in Firefox Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2015-2713 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