dbcve.org
FirefoxWeb browser · Mozilla

CVE-2022-22742

MEDIUM · 6.5 CVSS v3.1 Published 2022-12-22
Fix available
A fix is available. Upgrade to 91.5 / 96.0 or later.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable No privileges

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
When inserting text while in edit mode, some characters might have lead to out-of-bounds memory access causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

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

Memory corruption vulnerability in Firefox and Thunderbird's text editing component where inserting certain characters causes out-of-bounds memory access, potentially leading to an exploitable crash.

MitigationUpdate Firefox to version 96+, Firefox ESR to 91.5+, or Thunderbird to 91.5+ 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
FirefoxWeb browser
Affected:< 96.0
Firefox EsrWeb browser
Affected:< 91.5
ThunderbirdApplication
Affected:< 91.5

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
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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 Mozilla Firefox version
    Open Firefox and navigate to Help > About Firefox, or type 'about:support' in the address bar and look for the 'Version' field
    Affected if The version listed is below 96.0 (for example, 95.x or earlier)
  2. Check Mozilla Firefox ESR version
    Open Firefox ESR and navigate to Help > About Firefox ESR, or type 'about:support' in the address bar and look for the 'Version' field
    Affected if The version listed is below 91.5 (for example, 91.4.x or earlier)
  3. Check Mozilla Thunderbird version
    Open Thunderbird and navigate to Help > About Thunderbird, or go to Thunderbird Settings > About (on macOS)
    Affected if The version listed is below 91.5 (for example, 91.4.x or earlier)
  4. Identify text editing usage context
    The vulnerability affects the text editing component used in editable content areas such as input fields, textareas, and contentEditable elements across websites and applications
    Affected if The browser or email client is used for text input activities and the installed version is below the fixed releases

A user is affected if they are running any version of Firefox below 96.0, Firefox ESR below 91.5, or Thunderbird below 91.5, and they use text input functionality in the browser or email client.

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 91.5 / 96.0 or later
Fixed in 91.596.0
Interim mitigation

Update Firefox to version 96+, Firefox ESR to 91.5+, or Thunderbird to 91.5+ to patch the vulnerability.

Recommended fix High confidence

Firefox 96.0, Firefox ESR 91.5, Thunderbird 91.5

  1. 1. Check the current installed version of Firefox, Firefox ESR, or Thunderbird by navigating to Help > About (or using the 'firefox --version' or 'thunderbird --version' command line)
  2. 2. For Firefox users: Update to version 96.0 or later by using the application's built-in update mechanism (Help > Check for Updates) or download from https://www.mozilla.org/firefox/
  3. 3. For Firefox ESR users: Update to version 91.5 or later from https://www.mozilla.org/firefox/enterprise/
  4. 4. For Thunderbird users: Update to version 91.5 or later from https://www.thunderbird.net/
  5. 5. After updating, verify the version number matches or exceeds the fixed release

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

Fix this in Firefox Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

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-2022-22742 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