FirefoxWeb browser · Mozilla
CVE-2017-7827
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 · uneditedMemory safety bugs were reported in Firefox 56. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 57.
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 confidenceFirefox versions prior to 57 contained multiple memory safety bugs that could lead to memory corruption. An attacker could exploit these vulnerabilities to potentially execute arbitrary code by tricking a user into visiting a specially crafted webpage.
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
<= 56.0.2CVSS 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
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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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Check if Firefox is installedLook for Firefox in common installation locations: Windows (C:\Program Files\Mozilla Firefox\), macOS (/Applications/Firefox.app), or Linux (which firefox). On Windows, also check the registry under HKLM\SOFTWARE\Mozilla\Mozilla Firefox or HKLM\SOFTWARE\WOW6432Node\Mozilla\Mozilla Firefox.Affected if Firefox is not found on the system, this CVE does not apply.
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Determine the installed Firefox version numberRun 'firefox --version' on Linux, 'firefox -v' on macOS terminal, or check Help > About Firefox in the browser. On Windows, you can also check the executable properties of firefox.exe or query the registry key: reg query "HKLM\SOFTWARE\Mozilla\Mozilla Firefox" /v CurrentVersionAffected if No version number can be determined means Firefox may not be installed or is not the standard Mozilla build.
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Compare version against the affected rangeCompare your installed version number to the affected range: any version <= 56.0.2 is vulnerable. Firefox 57 and later are not affected. Note that some organizations use Extended Support Release (ESR) versions which have different numbering.Affected if The installed version is 56.0.2 or any earlier version (such as 56.0, 55.x, 54.x, etc.).
You are affected if Firefox is installed and the version number is 56.0.2 or lower.
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.
dbcve · scopedUpgrade Firefox to version 57 or later to address the memory corruption vulnerabilities that could allow remote code execution.
Firefox 57 or later
- Upgrade Firefox to version 57 or later to remediate this vulnerability
- Verify the upgrade was successful by checking About Firefox (Help > About Firefox)
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation1.0 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 $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-7827 — 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-2017-7827 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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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.
- 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