CVE-2024-12830
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 · uneditedArista NG Firewall custom_handler Directory Traversal Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Arista NG Firewall. Authentication is not required to exploit this vulnerability. The specific flaw exists within the implementation of the custom_handler method. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to execute code in the context of the www-data user. Was ZDI-CAN-24019.
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 confidenceArista NG Firewall contains a directory traversal vulnerability in the custom_handler method that allows unauthenticated remote attackers to execute arbitrary code. The flaw stems from insufficient validation of user-supplied paths before file operations, enabling attackers to traverse directories and potentially write or execute malicious files in the context of the www-data user.
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= 17.1.1CVSS 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
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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 Arista NG Firewall installationLocate the Arista NG Firewall installation and determine the installed software version. This is typically visible in the system dashboard, about page, or by querying the package manager if command-line access is available.Affected if The installed version is 17.1.1 exactly
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Verify custom_handler method accessibilityDetermine if the web management interface is exposed to the network. The custom_handler method is accessed via HTTP/HTTPS requests to the web interface. Check network exposure settings and firewall rules.Affected if The web interface is network-accessible and the custom_handler endpoint is reachable without authentication
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Review access logs for traversal patternsExamine web server access logs for suspicious requests containing directory traversal sequences such as '../', '..\', or unusual path parameters targeting the custom_handler endpoint.Affected if Log entries show attempts to access custom_handler with path traversal sequences, or unexpected custom_handler requests from untrusted sources
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Check for unauthorized file modificationsAudit the filesystem for any unexpected files or modifications in web-accessible directories, particularly in areas where the www-data user has write permissions.Affected if New or modified files appear in web directories that were not created by legitimate administrative actions
You are affected if running Arista NG Firewall version 17.1.1 with the web interface network-accessible, as this specific version contains the path validation flaw in custom_handler that allows unauthenticated directory traversal and code execution.
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 dataApply vendor-provided patches for CVE-2024-12830 to address the path validation flaw in custom_handler. If no patch is immediately available, consider restricting network access to the affected interface or implementing WAF rules to detect and block directory traversal patterns.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2024-12830 — 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-2024-12830 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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