CVE-2025-0510
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 · uneditedThunderbird displayed an incorrect sender address if the From field of an email used the invalid group name syntax that is described in CVE-2024-49040. This vulnerability was fixed in Thunderbird 128.7 and Thunderbird 135.
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 confidenceThunderbird incorrectly displayed sender addresses when processing emails with invalid group name syntax in the From header (related to CVE-2024-49040). This could cause users to trust emails from spoofed senders since the displayed sender address did not match the actual sender, leading to potential phishing or social engineering attacks.
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>= 128.0.1, < 128.7.0>= 131.0, < 135.0CVSS 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
- 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 checksWork through these to decide whether this CVE applies to you.
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Determine Thunderbird versionOpen Thunderbird, then go to Help > About Thunderbird (on Windows/Linux) or Thunderbird > About Thunderbird (on macOS). Alternatively, run 'thunderbird --version' from a command line.Affected if The displayed version falls within 128.0.1 through 128.6.x, or 131.0 through 134.x
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Verify email display behaviorReceive or view an email containing a From header with invalid group name syntax (e.g., 'Display Name <[email protected]>' where the group portion contains malformed data).Affected if The sender address shown in the message header does not match the actual sender envelope address, or the displayed sender differs from what is shown in the raw header source
A user is affected if their Thunderbird version is 128.0.1 to 128.6.x or 131.0 to 134.x and they view emails with malformed From header group syntax.
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 · scoped128.7.0135.0
Update Thunderbird to version 128.7, 135, or later to remediate this vulnerability. Organizations should ensure consistent patch deployment across all client systems running Thunderbird.
Thunderbird 128.7 or Thunderbird 135 (or later)
- Verify current Thunderbird version by navigating to Help > About Thunderbird
- Download Thunderbird 128.7 or later (or Thunderbird 135 or later) from the official Mozilla Thunderbird website at www.mozilla.org
- Close Thunderbird completely before installing the update
- Run the installer and follow the prompts to complete the upgrade
- Restart Thunderbird after the upgrade completes
- Verify the fix by checking Help > About Thunderbird shows version 128.7 or higher, or 135 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-0510 — 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-2025-0510 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
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data