CVE-2017-7295
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 · uneditedAn issue was discovered in Contiki Operating System 3.0. A use-after-free vulnerability exists in httpd-simple.c in cc26xx-web-demo httpd, where upon a connection close event, the http_state structure was not deallocated properly, resulting in a NULL pointer dereference in the output processing function. This resulted in a board crash, which can be used to perform denial of service.
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 confidenceA use-after-free vulnerability exists in Contiki OS 3.0's httpd-simple.c web server (cc26xx-web-demo). When a connection closes, the http_state structure is not properly deallocated, leading to a NULL pointer dereference in the output processing function and causing a denial of service via board 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= 3.0CVSS 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
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 Contiki OS versionCheck the Contiki OS version installed or embedded in your firmware image. Look for version markers in the codebase, release tags, or firmware metadata that indicates the Contiki version.Affected if The version is Contiki OS 3.0 exactly.
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Verify httpd-simple.c is in useSearch the codebase or firmware image for the presence of the file httpd-simple.c. This file contains the vulnerable web server implementation.Affected if httpd-simple.c exists in your Contiki deployment.
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Confirm web server feature is enabledCheck your build configuration, Makefile, or project settings to determine if the Contiki web server (httpd) module is compiled and enabled. Look for variables such as HTTPD or WEBSERVER in your configuration.Affected if The Contiki web server is enabled in your build configuration.
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Check for cc26xx-web-demo usageInspect whether your project or firmware includes or references the cc26xx-web-demo application, which utilizes the vulnerable httpd-simple.c web server.Affected if The cc26xx-web-demo application is included in your build.
You are affected if your Contiki deployment is version 3.0 and includes the httpd-simple.c web server (or cc26xx-web-demo) with the web server feature enabled, because the vulnerability requires the http_state structure to exist and be improperly handled upon connection close.
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 dataFix the memory management in httpd-simple.c to properly deallocate the http_state structure upon connection close events, ensuring no dangling pointers remain.
- Consultation3.0 h
- Implementation6.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2017-7295 — 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-2017-7295 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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- Version or environment caveats, and links to real fixes
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