CVE-2003-0822
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 · uneditedBuffer overflow in the debug functionality in fp30reg.dll of Microsoft FrontPage Server Extensions (FPSE) 2000 and 2002 allows remote attackers to execute arbitrary code via a crafted chunked encoded request.
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 confidenceBuffer overflow in the debug functionality of fp30reg.dll in Microsoft FrontPage Server Extensions 2000 and 2002 allows remote attackers to execute arbitrary code via crafted chunked encoded HTTP requests.
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= 2000= 2002= 2002all versionsall versionsCVSS 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
- Partial
- Integrity
- Partial
- Availability
- Partial
AV:N/AC:L/Au:N/C:P/I:P/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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Locate fp30reg.dll on the systemSearch for fp30reg.dll in common FrontPage extensions installation directories such as C:\Program Files\Common Files\Microsoft Shared\web server extensions\ (for FPSE 2000/2002) or search the entire system using: dir /s /b C:\fp30reg.dllAffected if fp30reg.dll is found on the system - the vulnerable component is present
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Check the file version of fp30reg.dllRight-click fp30reg.dll, select Properties, then view the Version tab. Alternatively, use a command like: msinfo32 or third-party tool to extract the FileVersion attribute.Affected if The file version matches FrontPage Server Extensions 2000 (=10.0.0.6627 or similar) or 2002 (=10.0.0.6615 or similar) which are the affected versions per this CVE
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Confirm FrontPage Server Extensions are installed and runningCheck for the presence of FPSE administrative websites or the _vti_bin virtual directory in IIS. In IIS Manager, look for Web Service Extensions showing FrontPage Server Extensions, or check for _vti_pvt, _vti_bin, and _vti_log directories under web root.Affected if FPSE are installed and enabled - the attack surface exists; the vulnerability only applies when the extensions are active and processing HTTP requests
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Verify the server OS versionRun 'winver' or check System Properties to confirm the Windows version. Use 'systeminfo' from command line for detailed version information including service packs.Affected if The server runs Windows 2000 (any version) or Windows XP (any version) as these are listed as affected platforms in this CVE
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Identify if chunked encoding is enabled for the web serverCheck IIS configuration for FrontPage extensions handling chunked transfer encoding. This typically requires examining IIS logs or network traffic for Transfer-Encoding: chunked headers being processed by FPSE endpoints.Affected if The web server accepts and processes chunked encoded HTTP requests to FPSE endpoints (_vti_bin/fp30reg.dll or similar) - this is the specific attack vector for this buffer overflow
A user is affected if fp30reg.dll version 2000 or 2002 is present AND FrontPage Server Extensions are installed and running on Windows 2000 or XP, allowing the server to process chunked encoded HTTP requests to the vulnerable debug functionality.
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 dataApply Microsoft security patches for FrontPage Server Extensions to address the buffer overflow, or disable the vulnerable debug functionality if patches cannot be applied.
- Consultation3.0 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-2003-0822 — 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-2003-0822 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