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Debian LinuxOperating system · Debian

CVE-2018-5154

CRITICAL · 9.8 CVSS v3.0 Published 2018-06-11
Fix available
A fix is available. Upgrade to 52.8.0 / 60.0 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 while enumerating attributes during SVG animations with clip paths. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.

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 exists in the Gecko rendering engine when enumerating attributes during SVG animations involving clip paths. Memory is freed while still being referenced, leading to a potentially exploitable crash.

MitigationUpdate affected Mozilla products (Firefox and Thunderbird) to version 60 or later (or ESR 52.8+) to patch the 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
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:= 7.6
Enterprise Linux Server EusOperating system
Affected:= 7.5= 7.6
Enterprise Linux Server TusOperating system
Affected:= 7.6
Enterprise Linux WorkstationOperating system
Affected:= 6.0= 7.0
FirefoxWeb browser
Affected:< 52.8.0< 60.0

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 installed Firefox version
    Run 'firefox --version' from command line or navigate to 'about:firefox' in the browser address bar
    Affected if Version is below 52.8.0 or below 60.0 (non-ESR releases)
  2. Confirm Firefox release track
    In 'about:firefox', look at the 'Firefox' row to see if it shows 'ESR' (Extended Support Release)
    Affected if Running Firefox ESR and version is below 52.8.0, or running non-ESR and below 60.0
  3. Verify operating system is Debian or RHEL
    Run 'cat /etc/os-release' on Debian or 'cat /etc/redhat-release' on RHEL
    Affected if OS is Debian 7, 8, or 9; or RHEL 6.x or 7.x (including Server Aus/Eus/Tus variants or Workstation)
  4. Determine if SVG clip-path animations are in use
    Inspect web content or local HTML files for SVG elements containing 'clip-path' attributes with animated values (animate, animateTransform elements)
    Affected if SVG content with animated clip-path definitions is being processed by the browser

User is affected if running Firefox (non-ESR) below 60.0, or Firefox ESR below 52.8.0, on Debian 7/8/9 or RHEL 6/7, while viewing content containing SVG animations on clip paths.

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 52.8.0 / 60.0 or later
Fixed in 52.8.060.0
Interim mitigation

Update affected Mozilla products (Firefox and Thunderbird) to version 60 or later (or ESR 52.8+) to patch the vulnerability.

Recommended fix High confidence

Firefox >= 60, Firefox ESR >= 52.8, Thunderbird >= 52.8, or Thunderbird ESR >= 52.8

  1. Identify the installed Mozilla product (Firefox or Thunderbird) and its current version using 'firefox --version' or 'thunderbird --version'
  2. For Debian systems: Run 'sudo apt-get update && sudo apt-get upgrade' to receive the fixed packages from Debian security repositories
  3. For Red Hat Enterprise Linux systems: Run 'sudo yum update' or 'sudo dnf update' to apply vendor security patches
  4. Alternatively, manually download and install Firefox >= 60, Firefox ESR >= 52.8, or Thunderbird >= 52.8 from the official Mozilla website (https://www.mozilla.org/)
  5. After updating, verify the installed version with 'firefox --version' or 'thunderbird --version' to confirm the fix is applied
  6. Restart the browser or mail client to ensure the updated version is fully loaded
Caveat Users may experience compatibility issues with older add-ons or extensions that are not supported in newer browser versions; some legacy web applications may require updates

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

Fix this in Debian Linux Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
5.0 hours of engineering $890
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,424.

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-2018-5154 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