CVE-2024-26519
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 in Casa Systems NTC-221 version 2.0.99.0 and before allows a remote attacker to execute arbitrary code via a crafted payload to the /www/cgi-bin/nas.cgi component.
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 confidenceA critical remote code execution vulnerability in Casa Systems NTC-221 devices (version 2.0.99.0 and prior) allows unauthenticated remote attackers to execute arbitrary code by sending a crafted payload to the /www/cgi-bin/nas.cgi web component.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/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 the device modelCheck the device label, web interface, or SNMP inventory for the model name 'NTC-221' from Casa SystemsAffected if The device is a Casa Systems NTC-221 unit
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Determine the firmware versionAccess the device admin interface (typically via HTTP/HTTPS on the management port) and navigate to System > Status, System > About, or similar to view the firmware/software version. Alternatively, check via CLI using 'show version' or 'get system info' if SSH/Telnet is availableAffected if The firmware version is 2.0.99.0 or any version prior to 2.0.99.0
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Verify nas.cgi endpoint accessibilityAttempt to access http[s]://<device-ip>/www/cgi-bin/nas.cgi from an authorized management network. A successful HTTP 200 or 500 response indicates the endpoint exists and is reachableAffected if The nas.cgi endpoint returns any HTTP response (not a 404 or connection refused)
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Inspect for indicators of compromiseReview device logs, web server access logs, and any available security logs for unusual requests to /www/cgi-bin/nas.cgi. Look for suspicious patterns such as unusual HTTP methods, encoded characters, or commands like '|', ';', '$(', or '`' in the request URI or bodyAffected if Logs show unexpected or malicious-looking requests to nas.cgi containing command injection patterns
A user is affected if they have a Casa Systems NTC-221 device running firmware version 2.0.99.0 or prior, with the nas.cgi endpoint exposed on 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 dataUpdate the Casa Systems NTC-221 firmware to a version newer than 2.0.99.0. If immediate patching is not feasible, implement network segmentation or firewall rules to restrict access to the nas.cgi endpoint from untrusted networks.
- Consultation2.0 h
- Implementation3.0 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-2024-26519 — 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-2024-26519 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
- No spam, self-promotion, credentials, or personal data