FirefoxWeb browser · Mozilla

CVE-2010-3773

MEDIUM · 6.8 CVSS v2.0 Published 2010-12-10

Fix available

A fix is available. Upgrade to after 3.5.15 or later.

See remediation →

77/100

Remediation priority · High

Remotely reachable No privileges Zero-click

Official description

NVD · unedited

Mozilla Firefox before 3.5.16 and 3.6.x before 3.6.13, and SeaMonkey before 2.0.11, when the XMLHttpRequestSpy module in the Firebug add-on is used, does not properly handle interaction between the XMLHttpRequestSpy object and chrome privileged objects, which allows remote attackers to execute arbitrary JavaScript via a crafted HTTP response. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-0179.

Technical summary

dbcve analysis · high confidence

Mozilla Firefox and SeaMonkey contain a vulnerability in the XMLHttpRequestSpy module of the Firebug add-on. The module improperly handles interaction between the XMLHttpRequestSpy object and chrome privileged objects, allowing remote attackers to inject and execute arbitrary JavaScript via a crafted HTTP response. This is an incomplete fix for CVE-2010-0179.

MitigationUpgrade Firefox to version 3.5.16 or 3.6.13 and later, or SeaMonkey to version 2.0.11 and later. Alternatively, disable the Firebug add-on until the patch can be applied.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions

NVD · CPE data

FirefoxWeb browser

Affected:= 3.6= 3.6.2= 3.6.3= 3.6.4= 3.6.6= 3.6.7= 3.6.8= 3.6.9= 3.6.10= 3.6.11= 3.6.12<= 3.5.15

SeamonkeyApplication

Affected:<= 2.0.10= 1.0= 1.0.1= 1.0.2= 1.0.3= 1.0.4= 1.0.5= 1.0.6= 1.0.7= 1.0.8= 1.0.9= 1.1

CVSS breakdown

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?

dbcve checks

Work through these to decide whether this CVE applies to you.

Identify installed browser and version

Check if Mozilla Firefox or SeaMonkey is installed. For Firefox: go to Help > About Firefox, or run 'firefox --version' from command line. For SeaMonkey: go to Help > About SeaMonkey, or run 'seamonkey --version'.

Affected if The browser is Firefox version 3.5.x through 3.5.15, or Firefox 3.6, 3.6.2-3.6.12, or SeaMonkey 1.0-1.1.x, or SeaMonkey 2.0.10 or earlier.
Verify Firebug add-on is installed

In Firefox/SeaMonkey, go to Tools > Add-ons > Extensions, or navigate to the profile folder and check for Firebug extension files. The extension is typically named '[email protected]'.

Affected if Firebug add-on is installed and enabled.
Check if XMLHttpRequestSpy module is active

In Firebug, click the Firebug icon or press F12 to open the console. Look for the XMLHttpRequestSpy panel or check Firebug settings for enabled modules. This module is part of the Firebug Net panel functionality.

Affected if XMLHttpRequestSpy module is enabled in Firebug.
Compare versions against affected ranges

Document the exact browser version from step 1 and the Firebug version from Tools > Add-ons > Extensions > Firebug > Version. Compare these to the affected version lists in the CVE.

Affected if Browser version falls within the affected Firefox 3.5.x/3.6.x or SeaMonkey 1.x/2.0.x ranges AND Firebug with XMLHttpRequestSpy is present.

You are affected if you are running Firefox 3.5.x through 3.5.15 or 3.6/3.6.2-3.6.12, or SeaMonkey 1.x/2.0.10 or earlier, AND have the Firebug add-on installed with the XMLHttpRequestSpy module enabled.

Generated from the published advisory. Verify against your own configuration.

Remediation

From vendor data

Upgrade available Upgrade to a release after 3.5.15

Interim mitigation

Upgrade Firefox to version 3.5.16 or 3.6.13 and later, or SeaMonkey to version 2.0.11 and later. Alternatively, disable the Firebug add-on until the patch can be applied.

Fix this in Firefox Scoped from the published advisory

Consultation2.0 h
Implementation2.0 h
Testing1.0 h
Review / QA1.0 h

6.0 hours of engineering $1,090

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Scan for this in your stack

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References

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2010-3773 in production — separate from our analysis above.

Notes0 Guidelines

Know something about CVE-2010-3773?

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

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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

At a glance

A fix existsUpgrade to after 3.5.15 or later

Severity 6.8 Medium

Exploit likelihood EPSS, next 30 days 3.1%

Affects: Firefox

Remediation

A high-priority fix

Fix this in Firefox 6 hrs · Low

Typical engagement from $1,090

Get a fix See the full breakdown ↓

A high-priority vulnerability. Send your environment and a specialist will scope CVE-2010-3773 and return a fixed quote and timeline.

You’ll deal with our team directly and deploy the reviewed fix to staging first — never straight to production.

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.

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.

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.

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.

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.

Check your environment

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.

Scan for this in your stack

References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Practitioner notes

No notes yet

Official description

Technical summary

Affected products & versions

CVSS breakdown

Am I affected?

Remediation

References