CVE-2006-6876
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 fetchsms function in the SMS handling module (libsms_getsms.c) in OpenSER 1.2.0 and earlier allows remote attackers to cause a denial of service (crash) via a crafted SMS message, triggering memory corruption when the "beginning" buffer is copied to the third (pdu) argument.
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 fetchsms function in OpenSER's SMS handling module (libsms_getsms.c) allows remote attackers to send crafted SMS messages that cause memory corruption when the 'beginning' buffer is improperly copied to the pdu argument without proper bounds checking, leading to denial of service via 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<= 1.1.0CVSS 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
- 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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Identify the installed SIP server versionRun 'openser -V' or check the package manager for openser/openser-sips installed versionAffected if The version is OpenSER 1.1.0 or earlier (any version <= 1.1.0)
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Determine if the SMS module is loadedCheck the OpenSER configuration file (usually openser.cfg) for 'loadmodule' statements referencing 'libsms.so' or 'sms' module functionalityAffected if The SMS module (libsms) is loaded in the OpenSER configuration
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Verify the presence of the vulnerable SMS libraryLocate libsms_getsms.c or the compiled libsms module on the system - common paths include /lib or /usr/lib/openser/Affected if The file libsms_getsms.c exists in the installation or the libsms shared object is present
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Check if SMS handling is enabled in configurationReview the openser.cfg for 'fetchsms', 'sendsms', or SMS-related route blocks that utilize the SMS module functionsAffected if SMS functionality is actively configured and used in the OpenSER deployment
A system is affected if it runs any version of OpenSER <= 1.1.0 with the SMS handling module (libsms) loaded and the fetchsms function in use.
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 dataUpgrade from vulnerable OpenSER versions to current OpenSIPS (the modern successor) or apply bounds-checking patches to the fetchsms function in libsms_getsms.c before buffer copy operations.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2006-6876 — 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-2006-6876 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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