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FirefoxWeb browser · Mozilla

CVE-2015-7174

HIGH · 7.5 CVSS v2.0 Published 2015-09-24
Fix available
A fix is available. Upgrade to after 40.0.3 or later.
See remediation →
84/100
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
The nsAttrAndChildArray::GrowBy function in Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 might allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly have unspecified other impact via unknown vectors, related to an "overflow."

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

Integer overflow vulnerability in nsAttrAndChildArray::GrowBy function in Mozilla Firefox versions before 41.0 and Firefox ESR before 38.3 allows remote attackers to cause memory corruption and application crash via unspecified vectors related to an 'overflow' condition.

MitigationUpgrade affected Mozilla Firefox installations to version 41.0 or later (or ESR 38.3 or later) to remediate this 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:<= 40.0.3= 38.0= 38.0.1= 38.0.5= 38.1.0= 38.1.1= 38.2.0= 38.2.1

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
Partial
Availability
Partial

AV:N/AC:L/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. Identify installed Firefox version
    Navigate to Help > About Firefox (or enter 'about:support' in the address bar) to view the version number under 'Application Basics'
    Affected if Version is 40.0.3 or lower, or any of these: 38.0, 38.0.1, 38.0.5, 38.1.0, 38.1.1, 38.2.0, 38.2.1, or any 38.x ESR version before 38.3
  2. Confirm Firefox ESR status
    In 'about:support', check the 'Build ID' and 'Update Channel' fields. ESR builds typically display 'esr' in the version string (e.g., '38.2.1 ESR')
    Affected if Running Firefox ESR version 38.0 through 38.2.1 (any version before 38.3)
  3. Verify vulnerability trigger condition
    This vulnerability exists in the nsAttrAndChildArray::GrowBy function used during DOM node manipulation. The flaw triggers when array growth calculations overflow due to large attribute or child node operations
    Affected if Any Firefox version in the affected list that processes untrusted web content with complex DOM structures

You are affected if your Firefox version is 40.0.3 or lower, or any Firefox ESR version 38.0 through 38.2.1 (before 38.3).

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 40.0.3
Interim mitigation

Upgrade affected Mozilla Firefox installations to version 41.0 or later (or ESR 38.3 or later) to remediate this vulnerability.

Fix this in Firefox Scoped from the published advisory
  • Consultation3.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,440
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,304.

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-2015-7174 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