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Debian LinuxOperating system · Debian

CVE-2018-5102

CRITICAL · 9.8 CVSS v3.0 Published 2018-06-11
Fix available
A fix is available. Upgrade to 52.6.0 / 58.0 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 use-after-free vulnerability can occur when manipulating HTML media elements with media streams, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.

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 Firefox, Firefox ESR, and Thunderbird allows memory corruption when manipulating HTML media elements that use media streams. The vulnerability occurs when memory is freed but still referenced, leading to a potentially exploitable crash with remote code execution potential.

MitigationUpgrade affected installations to Firefox 58+, Firefox ESR 52.6+, or Thunderbird 52.6+ to patch the use-after-free vulnerability in HTML media element media stream handling.

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
Debian LinuxOperating system
Affected:= 7.0= 8.0= 9.0
Enterprise Linux DesktopOperating system
Affected:= 6.0= 7.0
Enterprise Linux ServerOperating system
Affected:= 6.0= 7.0
Enterprise Linux Server AusOperating system
Affected:= 7.4
Enterprise Linux Server EusOperating system
Affected:= 7.4= 7.5
Enterprise Linux WorkstationOperating system
Affected:= 6.0= 7.0
FirefoxWeb browser
Affected:< 58.0< 52.6.0
Ubuntu LinuxOperating system
Affected:= 14.04= 16.04= 17.10

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. Identify installed Mozilla product
    Run 'dpkg -l' or 'rpm -qa' to list installed packages, or check Help > About in the application
    Affected if Product is Mozilla Firefox, Firefox ESR, or Thunderbird
  2. Determine Firefox version
    Run 'firefox --version' or check Help > About in Firefox
    Affected if Version is less than 58.0 (e.g., 57.x or earlier)
  3. Determine Firefox ESR version
    Run 'firefox-esr --version' or check Help > About in Firefox ESR
    Affected if Version is less than 52.6.0 (e.g., 52.5.x or earlier)
  4. Determine Thunderbird version
    Run 'thunderbird --version' or check Help > About in Thunderbird
    Affected if Version is less than 52.6.0 (e.g., 52.5.x or earlier)
  5. Check OS-level package version on Debian/Ubuntu
    Run 'dpkg -l | grep -E "(firefox|thunderbird)" on Debian/Ubuntu systems
    Affected if Package version corresponds to unpatched releases

You are affected if you are running Firefox below 58.0, Firefox ESR below 52.6.0, or Thunderbird below 52.6.0, and using HTML media elements with media streams.

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 52.6.0 / 58.0 or later
Fixed in 52.6.058.0
Interim mitigation

Upgrade affected installations to Firefox 58+, Firefox ESR 52.6+, or Thunderbird 52.6+ to patch the use-after-free vulnerability in HTML media element media stream handling.

Recommended fix High confidence

Firefox >= 58.0, Firefox ESR >= 52.6.0, Thunderbird >= 52.6

  1. Check current Firefox version by navigating to about:support or running 'firefox --version'
  2. Check current Firefox ESR version by running 'firefox-esr --version'
  3. Check current Thunderbird version by running 'thunderbird --version'
  4. For Debian/Ubuntu: Run 'sudo apt-get update' followed by 'sudo apt-get install firefox firefox-esr thunderbird' to upgrade to latest available version
  5. For RHEL/CentOS: Run 'sudo yum update' or 'sudo dnf update' to apply security updates
  6. For systems with specific version requirements, ensure upgrade reaches Firefox 58.0+, Firefox ESR 52.6+, or Thunderbird 52.6+
  7. Restart the browser/application after upgrade
  8. Verify the version has been updated correctly after restart
Caveat Minor: Firefox 58 included WebVR API changes and H.264 support improvements; ensure any legacy add-ons are compatible

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

Fix this in Debian Linux Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing10.0 h
  • Review / QA6.0 h
34.0 hours of engineering $5,940
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $9,504.

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-2018-5102 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