CVE-2026-31195
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 · uneditedOS command injection vulnerability in the ping diagnostic handler in /bin/httpd_clientside in ALTICE LABS / SFR France GR140DG Fibre Router with firmware 3GN8020801R13, 3GN8020802R0A, or 3GN8020803R0A inserts unsanitized user input into a system() call, allowing authenticated remote attackers to execute arbitrary commands as root via crafted destAddr parameters using shell command substitution.
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 confidenceOS command injection in the ping diagnostic handler of the GR140DG router's httpd_clientside binary. The destAddr parameter is passed unsanitized directly to a system() call, allowing authenticated attackers to inject shell commands that execute as root via command substitution.
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
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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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Confirm device is a GR140DG routerAccess the router admin interface or check the device label/model number. Look for 'GR140DG' in the web UI footer or system information page.Affected if Device model is GR140DG and the firmware has not been patched
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Identify httpd_clientside binary versionIf you have SSH/telnet access to the router, run 'ls -la /usr/sbin/httpd_clientside' or check the binary directly. Otherwise, check the firmware version shown in the router admin panel under 'System' or 'Status'.Affected if The httpd_clientside binary exists and the firmware version is unknown or unpatched
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Verify ping diagnostic feature is accessibleLog into the router admin interface and navigate to the ping diagnostic tool (typically under 'Diagnostics', 'Tools', or 'Network Utilities'). Check if the ping functionality is exposed via the web interface.Affected if The ping diagnostic handler is accessible via the web interface or API endpoint
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Confirm authentication is required for the vulnerable endpointAttempt to access the ping feature without logging in. The CVE states authenticated attackers can exploit this, so verify whether authentication is actually enforced on the ping diagnostic endpoint.Affected if Authentication is enforced but the destAddr parameter is passed unsanitized to system calls
If the device is a GR140DG router with an unpatched firmware version where the ping diagnostic handler in httpd_clientside is accessible to authenticated users, the environment is affected by this command injection vulnerability.
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 firmware updates when available; if no update exists, restrict administrative access to trusted IPs only and consider network segmentation to limit exposure to authenticated attackers.
- Consultation4.0 h
- Implementation8.0 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-2026-31195 — 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-2026-31195 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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