FirefoxWeb browser · Mozilla
CVE-2024-1557
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 present in Firefox 122. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 123.
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 · moderate confidenceMemory safety bugs in Firefox 122 could allow memory corruption and potentially arbitrary code execution. Users should upgrade to Firefox 123 or later.
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
< 123.0CVSS 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
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/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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Confirm Firefox is installedCheck for Firefox installation by looking for the executable. On Windows, check C:\Program Files\Mozilla Firefox\firefox.exe or %LOCALAPPDATA%\Mozilla Firefox\firefox.exe. On macOS, check /Applications/Firefox.app. On Linux, check /usr/bin/firefox or /opt/firefox/.Affected if Firefox is not found on the system, then this CVE does not apply.
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Identify installed Firefox versionLaunch Firefox and navigate to Menu > Help > About Firefox, or enter 'about:support' in the address bar. Alternatively, run 'firefox --version' from command line on Linux/macOS, or check the version property of the executable.Affected if The displayed version number is less than 123.0 (for example, 122.x, 121.x, etc.).
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Check for automatic update statusIn Firefox, go to Menu > Help > About Firefox. Look at the 'Update' section to see if the browser reports it is up to date or if updates are pending.Affected if The About page shows a version prior to 123.0 and does not indicate the update to 123 or later has been applied.
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Verify patch application via version comparisonCompare your confirmed installed version against the affected range: versions prior to 123.0. The specific vulnerable versions are 122.x and any earlier version.Affected if The installed version falls within the range of 0 through 122.x (anything below 123.0).
A user is affected if Firefox is installed and the running version is any version number below 123.0.
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 · scoped123.0
Upgrade Firefox to version 123 or later to patch the memory safety vulnerabilities.
Firefox 123.0
- Download and install Firefox 123.0 or later from the official Mozilla website (www.mozilla.org)
- Verify the installed version by navigating to Firefox Menu > Help > About Firefox
- Confirm the version number displayed is 123.0 or higher
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation1.0 h
- Implementation2.0 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 $1,664.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-1557 — 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-2024-1557 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