CVE-2024-8394
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 · uneditedWhen aborting the verification of an OTR chat session, an attacker could have caused a use-after-free bug leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 128.2.
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 confidenceA use-after-free vulnerability exists in Thunderbird versions prior to 128.2 when aborting the verification of an OTR (Off-the-Record) chat session. The flaw occurs when memory is freed during the abort process but the application later attempts to access that freed memory, leading to a potentially exploitable crash.
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< 128.2.0CVSS 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
- 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 checksWork through these to decide whether this CVE applies to you.
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Determine Thunderbird installed versionOn Windows, go to Help > About Thunderbird. On Linux, run 'thunderbird --version' or check /usr/lib/thunderbird/VERSION. On macOS, run 'thunderbird --version' or check /Applications/Thunderbird.app/Contents/Info.plist.Affected if The installed version is earlier than 128.2.0 (for example, 128.1.x, 128.0.x, or earlier release lines)
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Identify if OTR messaging is configuredLook for OTR-related settings in Thunderbird. Check account settings for any OTR encryption options, or search for 'otr' in Thunderbird's config editor (about:config). OTR is typically used for instant messaging integration.Affected if OTR (Off-the-Record) messaging is enabled or has been used in any configured chat/messaging account
You are affected if Thunderbird is installed at a version earlier than 128.2.0 AND you have OTR messaging functionality enabled or have used OTR-encrypted chat sessions.
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.
dbcve · scoped128.2.0
Upgrade Thunderbird to version 128.2 or later to resolve this vulnerability.
Thunderbird 128.2.0
- 1. Check current Thunderbird version: Go to Help > About Thunderbird
- 2. Download Thunderbird 128.2.0 or later from the official Mozilla website (www.mozilla.org)
- 3. Install the updated version to remediate the use-after-free vulnerability in OTR chat session verification
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 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 $1,424.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-8394 — 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-2024-8394 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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- 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
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