dbcve.org
FirefoxWeb browser · Mozilla

CVE-2018-18498

CRITICAL · 9.8 CVSS v3.0 Published 2019-02-28
Fix available
A fix is available. Upgrade to 60.4 / 64.0 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
A potential vulnerability leading to an integer overflow can occur during buffer size calculations for images when a raw value is used instead of the checked value. This leads to a possible out-of-bounds write. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

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

An integer overflow vulnerability in Firefox and Thunderbird allows buffer size calculations for images to use an unchecked raw value instead of a validated value, leading to potential out-of-bounds memory writes during image processing.

MitigationUpgrade to Firefox 64+, Firefox ESR 60.4+, or Thunderbird 60.4+ to apply the integer overflow check fix.

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:< 64.0
Firefox EsrWeb browser
Affected:< 60.4
Debian LinuxOperating system
Affected:= 8.0= 9.0
Ubuntu LinuxOperating system
Affected:= 14.04= 16.04= 18.04= 18.10
Enterprise Linux DesktopOperating system
Affected:= 6.0= 7.0
Enterprise Linux ServerOperating system
Affected:= 6.0= 7.0
Enterprise Linux Server AusOperating system
Affected:= 7.6
Enterprise Linux Server EusOperating system
Affected:= 7.6

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
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 checks

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

  1. Check Firefox version
    Open Firefox and navigate to Help > About Firefox, or run 'firefox --version' from command line
    Affected if Version is less than 64.0 (for standard Firefox)
  2. Check Firefox ESR version
    Open Firefox ESR and navigate to Help > About Firefox ESR, or run 'firefox-esr --version' from command line
    Affected if Version is less than 60.4 (for Firefox ESR)
  3. Check Thunderbird version
    Open Thunderbird and navigate to Help > About Thunderbird, or run 'thunderbird --version' from command line
    Affected if Version is less than 60.4 (for Thunderbird)
  4. Verify Linux distribution package versions
    On Debian-based systems run 'dpkg -l | grep -i firefox' or 'dpkg -l | grep -i thunderbird'; on RHEL-based systems run 'rpm -qa | grep -i firefox' or 'rpm -qa | grep -i thunderbird'
    Affected if Installed package version is older than the fixed releases for the specific distribution version

If Firefox is below 64.0, Firefox ESR or Thunderbird is below 60.4, or the installed package version matches the affected Debian/Ubuntu/RHEL versions listed, the environment is vulnerable to the integer overflow during image processing.

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 60.4 / 64.0 or later
Fixed in 60.464.0
Interim mitigation

Upgrade to Firefox 64+, Firefox ESR 60.4+, or Thunderbird 60.4+ to apply the integer overflow check fix.

Recommended fix High confidence

Firefox 64.0+, Firefox ESR 60.4+, or Thunderbird 60.4+

  1. For Firefox: Upgrade to Firefox 64.0 or later
  2. For Firefox ESR: Upgrade to Firefox ESR 60.4 or later
  3. For Thunderbird: Upgrade to Thunderbird 60.4 or later
  4. On Linux systems, use your package manager to update (e.g., apt-get update && apt-get upgrade firefox for Debian/Ubuntu, or yum update firefox for Enterprise Linux)
  5. Restart the browser/application after updating
  6. Verify the installed version matches or exceeds the fixed release (Firefox: 64.0+, Firefox ESR: 60.4+, Thunderbird: 60.4+)
Caveat Major version upgrades may break compatibility with older browser extensions or plugins; test critical workflows after upgrade

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

Fix this in Firefox Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing12.0 h
  • Review / QA6.0 h
30.0 hours of engineering $5,120
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,192.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2018-18498 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2018-18498 in production — separate from our analysis above.

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