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FirefoxWeb browser · Mozilla

CVE-2017-7778

CRITICAL · 9.8 CVSS v3.0 Published 2018-06-11
Fix available
A fix is available. Upgrade to 1.3.10 / 52.2.0 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 number of security vulnerabilities in the Graphite 2 library including out-of-bounds reads, buffer overflow reads and writes, and the use of uninitialized memory. These issues were addressed in Graphite 2 version 1.3.10. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

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

Multiple memory corruption vulnerabilities in the Graphite 2 font rendering library, including out-of-bounds reads/writes and use of uninitialized memory. These flaws could allow arbitrary code execution when processing specially crafted Graphite fonts.

MitigationUpdate Graphite 2 to version 1.3.10 or later, or update affected Mozilla products (Firefox to 54+, Firefox ESR to 52.2+, Thunderbird to 52.2+) to remediate the vulnerable library.

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:< 52.2.0< 54.0
Debian LinuxOperating system
Affected:= 8.0= 9.0
ThunderbirdApplication
Affected:< 52.2.0
Graphite2Application
Affected:< 1.3.10

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 Graphite2 library version
    Locate the libgraphite2 library on the system (common paths: /usr/lib/, /usr/local/lib/, or via find /usr -name "*graphite*" 2>/dev/null). Check the file version using: strings <path_to_lib> | grep -i "graphite" or ldd <path_to_lib> if available, or check the package manager: dpkg -l | grep graphite2 (Debian) or rpm -qa | grep graphite2 (RHEL-based).
    Affected if Graphite2 library version is found to be earlier than 1.3.10, or the library is present but version cannot be determined
  2. Check Mozilla Firefox version
    Run firefox --version or check the installed package: dpkg -l | grep firefox (Debian) or rpm -q firefox (RHEL-based). On Windows, check Help > About Firefox or the executable properties.
    Affected if Firefox version is earlier than 52.2.0 (ESR) or earlier than 54.0 (regular release)
  3. Check Mozilla Thunderbird version
    Run thunderbird --version or check the installed package: dpkg -l | grep thunderbird (Debian) or rpm -q thunderbird (RHEL-based). On Windows, check Help > About Thunderbird or the executable properties.
    Affected if Thunderbird version is earlier than 52.2.0
  4. Verify if Graphite font support is active
    Check if any Graphite-enabled fonts (.ttf, .otf with Graphite tables) are installed on the system: find /usr/share/fonts -name "*.ttf" -o -name "*.otf" 2>/dev/null | xargs -I {} fonttools {} to check for GRAD, SILF tables, or review font packages installed that support Graphite (such as graphite-font-*.deb).
    Affected if Graphite-enabled fonts are installed and the application uses the Graphite2 library to render them, enabling the vulnerable code path

The environment is affected if Graphite2 library version is below 1.3.10, or if Firefox/Thunderbird versions fall below the vulnerable ranges (Firefox <52.2.0/<54.0, Thunderbird <52.2.0), AND Graphite-enabled fonts are processed by the affected software.

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 1.3.10 / 52.2.0 / 54.0 or later
Fixed in 1.3.1052.2.054.0
Interim mitigation

Update Graphite 2 to version 1.3.10 or later, or update affected Mozilla products (Firefox to 54+, Firefox ESR to 52.2+, Thunderbird to 52.2+) to remediate the vulnerable library.

Recommended fix High confidence

Graphite2 >= 1.3.10; Firefox >= 54; Firefox ESR >= 52.2; Thunderbird >= 52.2

  1. Upgrade Graphite2 library to version 1.3.10 or later
  2. For systems with Firefox < 54, upgrade Firefox to version 54 or later
  3. For systems with Firefox ESR < 52.2, upgrade Firefox ESR to version 52.2 or later
  4. For systems with Thunderbird < 52.2, upgrade Thunderbird to version 52.2 or later
  5. On Debian Linux 8.0 and 9.0, apply security updates for the graphite2 package via apt-get update && apt-get upgrade
Caveat Upgrading to newer major versions of Firefox/Thunderbird may introduce compatibility issues with older extensions or plugins

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

Fix this in Firefox Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,490
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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-2017-7778 in production — separate from our analysis above.

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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