Debian LinuxOperating system · Debian
CVE-2017-7752
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 · uneditedA use-after-free vulnerability during specific user interactions with the input method editor (IME) in some languages due to how events are handled. This results in a potentially exploitable crash but would require specific user interaction to trigger. 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 · moderate confidenceA use-after-free vulnerability exists in the input method editor (IME) event handling code in Firefox and Thunderbird. The issue occurs when specific user interactions with IME trigger improper memory cleanup, leading to a potentially exploitable crash. This affects multiple products and versions with CVSS 8.8 severity.
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
= 8.0= 9.0
Enterprise LinuxOperating system
= 6.0= 7.0
Enterprise Linux DesktopOperating system
= 6.0= 7.0
Enterprise Linux ServerOperating system
= 6.0= 7.0
Enterprise Linux Server AusOperating system
= 7.3= 7.4
Enterprise Linux Server EusOperating system
= 7.3= 7.4= 7.5
Enterprise Linux WorkstationOperating system
= 6.0= 7.0
FirefoxWeb browser
< 54.0< 52.2.0CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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 checksWork through these to decide whether this CVE applies to you.
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Check if Firefox is installedRun: which firefox or rpm -q firefox or dpkg -l firefoxAffected if Firefox is not found on the system, skip remaining Firefox checks
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Determine Firefox versionRun: firefox --version or rpm -q firefox --qf '%{VERSION}'Affected if Version is less than 54.0 (for standard Firefox) or less than 52.2.0 (for Firefox ESR)
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Check if Thunderbird is installedRun: which thunderbird or rpm -q thunderbird or dpkg -l thunderbirdAffected if Thunderbird is not found on the system, skip Thunderbird checks
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Determine Thunderbird versionRun: thunderbird --version or rpm -q thunderbird --qf '%{VERSION}'Affected if Version is less than 52.2.0
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Verify IME usage contextCheck if the system uses an Input Method Editor (IME) for non-Latin text input, such as CJK (Chinese/Japanese/Korean) input methods. Look for IME-related processes or packages: ps aux | grep -i ime or rpm -qa | grep -i imeAffected if The vulnerability only applies when IME is actively used for text input; systems without IME may not be vulnerable regardless of version
A system is affected if Firefox < 54.0 or Firefox < 52.2.0 (ESR) or Thunderbird < 52.2.0 is installed AND the user uses an Input Method Editor for text input.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor data52.2.054.0
Upgrade to Firefox 54 or later, Firefox ESR 52.2 or later, or Thunderbird 52.2 or later to patch the vulnerability. No user-level workaround is available for this issue.
Fix this in Debian Linux
Scoped from the published advisory
- Consultation1.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-7752 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2017-7752 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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