CVE-2007-3438
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 SIP header parsing module in the Nortel PC Client SIP Soft Phone 4.1 3.5.208[20051015] allows remote attackers to execute arbitrary code via a malformed message, a different vulnerability than CVE-2007-3361.
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 confidenceBuffer overflow vulnerability in the SIP header parsing module of Nortel PC Client SIP Soft Phone 4.1 allows remote attackers to execute arbitrary code via a specially crafted malformed SIP message. The overflow occurs during parsing of SIP headers, enabling an attacker to overwrite memory and potentially gain control of the affected system.
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= 4.13.5.208CVSS 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
- Complete
AV:N/AC:L/Au:N/C:N/I:N/A:C
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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Verify Nortel Sip Softphone installationCheck for the presence of Nortel Sip Softphone in the system program files or application directory. On Windows, check Registry keys under HKEY_LOCAL_MACHINE\SOFTWARE\Nortel or HKEY_CURRENT_USER\SOFTWARE\Nortel, or look for executable files named 'SipSoftphone.exe' or similar in Program Files.Affected if Nortel Sip Softphone software is found on the system
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Confirm installed version matches affected releaseRight-click the application executable, select Properties, then check the Version tab. Alternatively, check the version information in the Windows Registry or run 'msiexec /x{ProductCode}' to query installer details.Affected if The installed version is exactly 4.13.5.208
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Verify SIP protocol functionality is activeCheck if the application is configured to receive SIP connections. Look for SIP port listening status using 'netstat -an | findstr :5060' or check the application's configuration for enabled SIP accounts or profiles.Affected if The SIP softphone has an active SIP account or profile configured and is running
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Confirm application is running and exposed to networkUse Task Manager to verify the Sip Softphone process is running, and run 'netstat -ano' to confirm the application is listening on UDP/TCP port 5060 or other SIP ports.Affected if The application process is running and bound to a network interface listening for SIP traffic
A system is affected only if Nortel Sip Softphone version 4.13.5.208 is installed, the SIP functionality is configured and enabled, and the application is running and exposed to incoming SIP messages.
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 dataIf the affected software is still in use, immediately apply any available vendor patches or migrate to a supported SIP soft phone solution. Network-based filtering of SIP traffic can provide a temporary compensating control, but does not address the underlying vulnerability.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2007-3438 — 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-2007-3438 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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