CVE-2003-0302
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 · uneditedThe IMAP Client for Eudora 5.2.1 allows remote malicious IMAP servers to cause a denial of service and possibly execute arbitrary code via certain large literal size values that cause either integer signedness errors or integer overflow errors.
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 confidenceEudora 5.2.1 IMAP client fails to properly validate large literal size values received from IMAP servers, leading to integer signedness or overflow errors. A malicious server can send specially crafted IMAP protocol responses causing denial of service or potentially arbitrary code execution on the client.
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= 5.2.1CVSS 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
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Partial
AV:N/AC:L/Au:N/C:N/I:N/A:P
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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Confirm Eudora installationCheck for Eudora executable at typical install paths such as C:\Program Files\Qualcomm\Eudora\Eudora.exe or C:\Program Files\Eudora\Eudora.exe. Use Start -> Search or File Explorer to locate eudora.exe on the system.Affected if Eudora executable is found on the system
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Verify exact version is 5.2.1Right-click the Eudora.exe file, select Properties, then go to the Version tab to read the File Version or Product Version field. Alternatively, check the Windows Registry under HKLM\SOFTWARE\Qualcomm\Eudora\CurrentVersion for the Version value.Affected if The installed version reads exactly 5.2.1
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Check for IMAP account configurationOpen Eudora and go to Tools -> Options -> Mail Account (or check the eudora.ini file for [Mailbox] sections). Look for entries with server type set to IMAP. In the UI, inspect the account settings to see if any accounts are configured to use IMAP instead of POP.Affected if One or more IMAP accounts are configured in Eudora
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Identify configured IMAP serversIn Eudora's account settings, examine each IMAP account and note the Server field. This shows which IMAP servers the client connects to. Also check Tools -> Options -> Incoming Mail for the server names.Affected if Any IMAP server is listed in the account configuration, as the client will parse responses from that server
A user is affected if Eudora version 5.2.1 is installed and has any IMAP account configured, because the vulnerable IMAP response parsing code executes upon connecting to an IMAP server.
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 dataThis is a legacy, likely end-of-life product (circa 2003). Users should migrate to a supported mail client. If Eudora must be used, ensure connections only to trusted IMAP servers.
- Consultation2.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2003-0302 — 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-2003-0302 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
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