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FirefoxWeb browser · Mozilla

CVE-2024-0753

MEDIUM · 6.5 CVSS v3.1 Published 2024-01-23
Fix available
A fix is available. Upgrade to 115.7 / 122.0 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
In specific HSTS configurations an attacker could have bypassed HSTS on a subdomain. This vulnerability affects Firefox < 122, Firefox ESR < 115.7, and Thunderbird < 115.7.

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

This is a client-side browser vulnerability in Firefox and Thunderbird that allows bypassing HTTP Strict Transport Security (HSTS) protection on specific subdomains under certain HSTS configurations. An attacker could potentially intercept traffic that should be protected by HSTS forcing HTTPS connections.

MitigationDeploy the patched versions (Firefox >= 122, Firefox ESR >= 115.7, Thunderbird >= 115.7) to all affected endpoints. For organizations, this typically involves standard patch management deployment and verification.

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:< 122.0
Firefox EsrWeb browser
Affected:< 115.7
Debian LinuxOperating system
Affected:= 10.0
ThunderbirdApplication
Affected:< 115.7

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
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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 installed Mozilla products
    Check for Firefox or Thunderbird installations: On Windows, look in Program Files; on Linux, run 'dpkg -l | grep -E "firefox|thunderbird"' or 'rpm -qa | grep -E "firefox|thunderbird"'; on macOS, check /Applications for Firefox.app or Thunderbird.app
    Affected if Neither Firefox nor Thunderbird is installed on the system
  2. Determine Firefox version
    Run 'firefox --version' from command line, or in Firefox go to Help > About Firefox
    Affected if Version is below 122.0 for regular Firefox, or below 115.7 for Firefox ESR
  3. Determine Thunderbird version
    Run 'thunderbird --version' from command line, or in Thunderbird go to Help > About Thunderbird
    Affected if Version is below 115.7 for Thunderbird
  4. Check HSTS configuration status
    Examine browser configuration for HSTS settings: In Firefox, navigate to about:config and search for 'security.tls.version.max' and check for any custom HSTS preload or domain-specific HSTS policies in the profile directory (secState.db or cert8.db in older profiles)
    Affected if HSTS is enabled or configured, and the browser version is vulnerable as determined above

You are affected if Firefox (regular < 122.0 or ESR < 115.7) or Thunderbird < 115.7 is installed AND HSTS is enabled or configured in the browser.

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 115.7 / 122.0 or later
Fixed in 115.7122.0
Interim mitigation

Deploy the patched versions (Firefox >= 122, Firefox ESR >= 115.7, Thunderbird >= 115.7) to all affected endpoints. For organizations, this typically involves standard patch management deployment and verification.

Recommended fix High confidence

Firefox 122.0, Firefox ESR 115.7, Thunderbird 115.7

  1. For Firefox users: Upgrade to Firefox 122.0 or later by navigating to Help > About Firefox > Check for Updates
  2. For Firefox ESR users: Upgrade to Firefox ESR 115.7 or later via your organization's patch management
  3. For Thunderbird users: Upgrade to Thunderbird 115.7 or later by navigating to Help > About Thunderbird > Check for Updates
  4. For Debian 10 (Buster) systems: Run 'apt update' followed by 'apt upgrade' to apply the latest Debian security updates for Mozilla packages, or specifically upgrade firefox-esr/thunderbird packages

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA1.0 h
9.0 hours of engineering $1,600
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,560.

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-2024-0753 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