CVE-2007-3728
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 lib/silcclient/client_notify.c of SILC Client and SILC Toolkit before 1.1.2 allows remote attackers to cause a denial of service via "NICK_CHANGE" notifications.
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 vulnerability in lib/silcclient/client_notify.c in SILC Client and SILC Toolkit versions prior to 1.1.2. The vulnerability is triggered via specially crafted NICK_CHANGE notifications, allowing remote attackers to cause a denial of service through buffer overflow.
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= 1.1.1= 1.1.1CVSS 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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Identify if SILC Client is installedRun 'silc --version' or check for silc client binaries in common paths like /usr/bin/silc, /usr/local/bin/silc, or through package managers like dpkg -l | grep silcAffected if SILC Client is found on the system
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Check SILC Client versionRun 'silc --version' or check the application version through your package manager. Compare the version number to 1.1.1Affected if The installed version is exactly 1.1.1
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Identify if SILC Toolkit is installedCheck for silc libraries and toolkit components through package listings, or look for silcd daemon binary and libsilc librariesAffected if SILC Toolkit libraries or daemon are present
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Check SILC Toolkit versionRun 'silcd --version' if available, or check library versions. Compare the version number to 1.1.1Affected if The installed version is exactly 1.1.1
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Verify NICK_CHANGE notification processingThis vulnerability triggers when the client processes incoming NICK_CHANGE notifications from the SILC network. If the SILC client is actively connecting to a server and processing user nicknames, the vulnerable code path is reachableAffected if The SILC client is operational and can receive NICK_CHANGE notifications from remote servers
A user is affected if they have SILC Client or SILC Toolkit version 1.1.1 installed and the client is capable of processing NICK_CHANGE notifications from the network.
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 to SILC Client and SILC Toolkit version 1.1.2 or later. If immediate upgrade is not feasible, implement input validation and bounds checking on NICK_CHANGE notification processing as a compensating control.
- 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-2007-3728 — 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-2007-3728 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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