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FirefoxWeb browser · Mozilla

CVE-2013-1681

HIGH · 10.0 CVSS v2.0 Published 2013-05-16
Fix available
A fix is available. Upgrade to after 20.0.1 or later.
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
Use-after-free vulnerability in the nsContentUtils::RemoveScriptBlocker function in Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

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

A use-after-free vulnerability in the nsContentUtils::RemoveScriptBlocker function in Mozilla Firefox and Thunderbird allows remote attackers to execute arbitrary code or cause denial of service via heap memory corruption. The vulnerability occurs when script blockers are removed while references to the freed memory are still held.

MitigationUpgrade to Firefox 21.0 or later, Firefox ESR 17.0.6 or later, Thunderbird 17.0.6 or later, or Thunderbird ESR 17.0.6 or later to patch this 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:<= 20.0.1= 19.0= 19.0.1= 19.0.2= 20.0= 17.0= 17.0.1= 17.0.2= 17.0.3= 17.0.4= 17.0.5
ThunderbirdApplication
Affected:<= 17.0.5= 17.0= 17.0.1= 17.0.2= 17.0.3= 17.0.4
Thunderbird EsrApplication
Affected:= 17.0= 17.0.1= 17.0.2= 17.0.3= 17.0.4= 17.0.5

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
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/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 Firefox version
    Open Firefox, click the menu button (three horizontal lines), select Help, then About Firefox. The version number will be displayed.
    Affected if The version is 17.0, 17.0.1, 17.0.2, 17.0.3, 17.0.4, 17.0.5, 19.0, 19.0.1, 19.0.2, 20.0, or 20.0.1
  2. Check Thunderbird version
    Open Thunderbird, click the menu button (three horizontal lines), select Help, then About Thunderbird. The version number will be displayed.
    Affected if The version is 17.0, 17.0.1, 17.0.2, 17.0.3, 17.0.4, or 17.0.5 (includes both Thunderbird and Thunderbird ESR)
  3. Compare against affected version ranges
    Compare your installed version to the list of affected versions provided in the CVE documentation.
    Affected if Your installed version matches any version in the affected list, or is older than the oldest affected version listed

You are affected if you are running any Firefox version 17.0 through 20.0.1, or any Thunderbird version 17.0 through 17.0.5.

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
Upgrade available Upgrade to a release after 20.0.1
Interim mitigation

Upgrade to Firefox 21.0 or later, Firefox ESR 17.0.6 or later, Thunderbird 17.0.6 or later, or Thunderbird ESR 17.0.6 or later to patch this vulnerability.

Recommended fix High confidence

Firefox 21.0+ / Firefox ESR 17.0.6+ / Thunderbird 17.0.6+ / Thunderbird ESR 17.0.6+

  1. 1. Determine the exact version of Mozilla Firefox, Thunderbird, or Thunderbird ESR currently installed
  2. 2. For Firefox users: Upgrade to Firefox 21.0 or later
  3. 3. For Firefox ESR users: Upgrade to Firefox ESR 17.0.6 or later
  4. 4. For Thunderbird users: Upgrade to Thunderbird 17.0.6 or later
  5. 5. For Thunderbird ESR users: Upgrade to Thunderbird ESR 17.0.6 or later
  6. 6. Restart the application after upgrade
  7. 7. Verify the installed version matches or exceeds the fixed version
Caveat Minor risk - extension compatibility may need verification when upgrading Firefox versions

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

Fix this in Firefox Scoped from the published advisory
  • Consultation0.5 h
  • Implementation0.5 h
  • Testing0.5 h
  • Review / QA0.5 h
2.0 hours of engineering $750
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.

Scan for this in your stack

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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-2013-1681 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