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CVE Record

CVE-2018-17208: Linksys Velop 1.1.2.187020 devices allow unauthenticated command injection, providing an attacker with full...

Linksys Velop 1.1.2.187020 devices allow unauthenticated command injection, providing an attacker with full root access, via cgi-bin/zbtest.cgi or cgi-bin/zbtest2.cgi (scripts that can be discovered with binwalk on the firmware, but are not visible in the web interface). This occurs because shell metacharacters in the query string are mishandled by ShellExecute, as demonstrated by the zbtest.cgi?cmd=level&level= substring. This can also be exploited via CSRF.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2018-17208 is an unauthenticated command injection issue in Linksys Velop firmware 1.1.2.187020. The reported impact is full root access to the device. For executives, treat affected routers as high-risk infrastructure because compromise can undermine network trust, traffic routing, and downstream systems.

Executive priority

Prioritize discovery and containment quickly. Affected devices are network control points, and the reported impact is full root access without authentication. Absence from KEV lowers evidence of current exploitation, not technical severity.

Technical view

The CVE describes hidden CGI scripts, zbtest.cgi and zbtest2.cgi, that mishandle shell metacharacters in query strings passed through ShellExecute. The flaw is unauthenticated and may also be triggered through CSRF. Sources identify Linksys Velop 1.1.2.187020; broader version impact is not established in the bundle.

Likely exposure

Exposure is most likely where Linksys Velop devices run firmware 1.1.2.187020 and their web management interface is reachable by untrusted users, compromised LAN hosts, VPN users, or browser-based CSRF paths.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Public details describe unauthenticated root-level command injection and CSRF potential, which materially raises risk even without confirmed exploitation evidence.

Researcher notes

Evidence is limited to the CVE record, CVE List JSON, and the referenced researcher write-up. No CVSS, CWE, vendor advisory, or patch status is provided in the bundle. Avoid assuming affected versions beyond 1.1.2.187020.

Mitigation direction

  • Identify all Linksys Velop devices and record firmware versions.
  • Check Linksys or vendor guidance for fixed firmware or replacement advice.
  • Restrict device management access to trusted administrative networks only.
  • Reduce CSRF risk by separating administration browsing from general web use.
  • Monitor for unexpected requests to hidden CGI endpoints named in the CVE.

Validation and detection

  • Confirm whether any Velop devices run firmware 1.1.2.187020.
  • Verify management interfaces are not reachable from untrusted networks.
  • Review logs or telemetry for requests to zbtest.cgi or zbtest2.cgi.
  • Confirm remediation against vendor guidance before closing the issue.
  • Document any devices that cannot be patched and their compensating controls.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2018-17208 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.