FirefoxWeb browser · Mozilla
CVE-2015-0828
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 · uneditedDouble free vulnerability in the nsXMLHttpRequest::GetResponse function in Mozilla Firefox before 36.0, when a nonstandard memory allocator is used, allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via crafted JavaScript code that makes an XMLHttpRequest call with zero bytes of data.
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 confidenceDouble-free vulnerability in Firefox's nsXMLHttpRequest::GetResponse function when XMLHttpRequest receives zero bytes of data. The flaw occurs with nonstandard memory allocators, causing heap memory corruption that could lead to arbitrary code execution.
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
<= 35.0.1= 0.1= 0.2= 0.3= 0.4= 0.5= 0.6= 0.6.1= 0.7= 0.7.1= 0.8= 0.9= 11.3= 13.1= 13.2CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify the installed productDetermine if Mozilla Firefox is installed on the system. On Oracle Solaris 11.3 or OpenSUSE 13.1/13.2, check for Firefox packages using the system package manager (pkg on Solaris, zypper on OpenSUSE).Affected if Firefox is installed on Oracle Solaris 11.3, OpenSUSE 13.1, or OpenSUSE 13.2
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Check Firefox versionRun 'firefox --version' or check the package version. For Solaris use 'pkg list firefox', for OpenSUSE use 'rpm -qa | grep firefox'.Affected if Version is 35.0.1 or earlier, or falls in the 0.x legacy versions (0.1 through 0.9)
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Verify XMLHttpRequest usageThis vulnerability affects any web content using XMLHttpRequest. Inspect any hosted web applications or browser-based tools that make XMLHttpRequest calls.Affected if The browser is used to load web content that utilizes XMLHttpRequest API and may receive zero-byte responses
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Confirm nonstandard allocator usageCheck if the environment uses custom memory allocators (such as jemalloc custom builds, hardening frameworks, or third-party memory management add-ons). This is typically evident in specialized Firefox builds.Affected if Firefox is compiled with or loaded alongside nonstandard memory allocators that interact with nsXMLHttpRequest::GetResponse
If Firefox version is 35.0.1 or earlier (including legacy 0.x versions) AND the browser loads web content using XMLHttpRequest, the system is potentially affected.
Generated from the published advisory. Verify against your own configuration.
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 dataUpgrade Mozilla Firefox to version 36.0 or later to obtain the patched version of the nsXMLHttpRequest component.
Fix this in Firefox
Scoped from the published advisory
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2015-0828 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2015-0828 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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