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FirefoxWeb browser · Mozilla

CVE-2010-1203

HIGH · 9.3 CVSS v2.0 Published 2010-06-24
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
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 JavaScript engine in Mozilla Firefox 3.6.x before 3.6.4 allow remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via vectors that trigger an assertion failure in jstracer.cpp.

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

Memory corruption vulnerability in Mozilla Firefox 3.6.x JavaScript tracing engine (jstracer.cpp) where specific JavaScript vectors trigger an assertion failure, leading to potential arbitrary code execution or denial of service via application crash.

MitigationUpgrade Mozilla Firefox to version 3.6.4 or later to obtain the patch that fixes the jstracer.cpp assertion failure 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:= 3.6= 3.6.2= 3.6.3

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
Complete
Integrity
Complete
Availability
Complete

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

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 installed Firefox version
    Open Firefox, click Help > About, or navigate to about:config and check the version property
    Affected if Version is 3.6, 3.6.2, or 3.6.3 exactly (not later)
  2. Verify JavaScript tracing engine is enabled
    Navigate to about:config and search for 'javascript.options.tracer' or 'jit.tracer' preferences
    Affected if The jstracer-related preference is set to true (enabled)
  3. Confirm trace-logging is active
    Check for the 'javascript.options.tracelog' preference in about:config
    Affected if Trace logging is enabled alongside the tracer feature

User is affected if running Firefox 3.6, 3.6.2, or 3.6.3 with the JavaScript tracing engine (jstracer) enabled via about:config preferences.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade Mozilla Firefox to version 3.6.4 or later to obtain the patch that fixes the jstracer.cpp assertion failure vulnerability.

Recommended fix High confidence

Firefox 3.6.4 or later (current supported release recommended)

  1. 1. Back up any important browser data (bookmarks, passwords, extensions) before upgrading
  2. 2. Download Firefox 3.6.4 or a current supported version from the official Mozilla website (firefox.com)
  3. 3. Close all running Firefox instances
  4. 4. Install the new version of Firefox over the existing installation or to a new directory
  5. 5. Restart Firefox and verify the version in Help > About Firefox
  6. 6. Reinstall any required extensions or add-ons compatible with the new version
  7. 7. Restore bookmarks and other user data from backup if needed
Caveat Very old extensions/add-ons from Firefox 3.6 may not be compatible with newer versions; some legacy web applications may require testing

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.

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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-2010-1203 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