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Debian LinuxOperating system · Debian

CVE-2017-5380

CRITICAL · 9.8 CVSS v3.0 Published 2018-06-11
Fix available
A fix is available. Upgrade to 45.7.0 / 51.0 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 use-after-free found through fuzzing during DOM manipulation of SVG content. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

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 remote code execution through crafted SVG content that exploits improper memory management during DOM manipulation operations.

MitigationUpgrade to Firefox 51 or later, Firefox ESR 45.7 or later, or Thunderbird 45.7 or later to address the memory corruption flaw.

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:= 9.0
Enterprise LinuxOperating system
Affected:= 5.0= 6.0= 7.0
Enterprise Linux DesktopOperating system
Affected:= 5.0= 6.0= 7.0
Enterprise Linux ServerOperating system
Affected:= 5.0= 6.0= 7.0
Enterprise Linux Server AusOperating system
Affected:= 7.3= 7.4
Enterprise Linux Server EusOperating system
Affected:= 7.3= 7.4= 7.5
Enterprise Linux WorkstationOperating system
Affected:= 5.0= 6.0= 7.0
FirefoxWeb browser
Affected:< 51.0< 45.7.0

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. Identify the installed Mozilla product
    Run 'firefox --version' for Firefox, 'firefox-esr --version' for Firefox ESR, or 'thunderbird --version' for Thunderbird. On Red Hat/Debian systems, check installed packages with 'rpm -qa | grep -i firefox' or 'dpkg -l | grep -i firefox'
    Affected if The product is Firefox, Firefox ESR, or Thunderbird and the version is unpatched
  2. Determine Firefox version
    If Firefox is installed, run 'firefox --version' and note the exact version number
    Affected if Version is below 51.0 (for example, 50.0, 50.1, etc.)
  3. Determine Firefox ESR version
    If Firefox ESR is installed, run 'firefox-esr --version' and note the exact version number
    Affected if Version is below 45.7.0 (for example, 45.6.0, 45.5.0, etc.)
  4. Check Red Hat or Debian package versions
    On Red Hat systems, run 'rpm -qa | grep -E "firefox|thunderbird"' to list installed Mozilla package versions. On Debian systems, run 'dpkg -l | grep -E "firefox|thunderbird"'
    Affected if The installed package version corresponds to an unpatched release (for Red Hat: versions before the fixed RHSA/advisory; for Debian: version 9.0 specifically)

A user is affected if they have Firefox below 51.0, Firefox ESR below 45.7.0, or Thunderbird below 45.7.0 installed, or if their OS-level package manager shows unpatched versions from the affected Red Hat or Debian releases.

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 45.7.0 / 51.0 or later
Fixed in 45.7.051.0
Interim mitigation

Upgrade to Firefox 51 or later, Firefox ESR 45.7 or later, or Thunderbird 45.7 or later to address the memory corruption flaw.

Recommended fix High confidence

Firefox 51.0+, Firefox ESR 45.7+, or Thunderbird 45.7+

  1. 1. Identify the affected application (Firefox, Firefox ESR, or Thunderbird) installed on the system
  2. 2. For Debian Linux 9.0: Update the package repository and upgrade the affected package (e.g., apt-get update && apt-get upgrade firefox-esr or thunderbird)
  3. 3. For Enterprise Linux (RHEL/CentOS): Use yum or dnf to update (e.g., yum update firefox or yum update thunderbird)
  4. 4. Alternatively, download the latest stable version directly from the official Mozilla website: https://www.mozilla.org/
  5. 5. Restart the application after upgrading
  6. 6. Verify the installed version matches or exceeds the fixed release (Firefox >= 51.0, Firefox ESR >= 45.7, Thunderbird >= 45.7)
Caveat Review extension compatibility as newer Firefox versions may deprecated or remove older extensions

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

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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-2017-5380 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