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CVE Record

CVE-2018-20334: An issue was discovered in ASUSWRT 3.0.0.4.384.20308.

An issue was discovered in ASUSWRT 3.0.0.4.384.20308. When processing the /start_apply.htm POST data, there is a command injection issue via shell metacharacters in the fb_email parameter. By using this issue, an attacker can control the router and get shell.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2018-20334 is a command injection flaw reported in ASUSWRT 3.0.0.4.384.20308. If an attacker can submit crafted data to the affected router endpoint, the source says they may control the router and obtain shell access. The public bundle does not provide CVSS, affected CPEs, or a named fixed version.

Executive priority

Prioritize exposed or business-critical ASUSWRT routers because compromise could hand an attacker control of the network edge. Urgency is high for internet-reachable management interfaces, but source evidence is incomplete on affected models and fixes.

Technical view

The issue is described in /start_apply.htm POST processing, where shell metacharacters in the fb_email parameter can trigger command injection. The affected software is only identified as ASUSWRT 3.0.0.4.384.20308 in the CVE description. No CWE, CVSS vector, or detailed vendor remediation is included in the provided sources.

Likely exposure

Exposure is most likely where ASUSWRT 3.0.0.4.384.20308 devices have reachable management functionality. The bundle does not confirm specific router models, authentication requirements, internet exposure conditions, or whether adjacent ASUSWRT versions are affected.

Exploitation context

The public description says successful exploitation can let an attacker control the router and get shell access. CISA KEV status is false in the bundle, and no cited source states active exploitation in the wild.

Researcher notes

The provided record is sparse: it names one ASUSWRT version and one vulnerable POST parameter but lacks CVSS, CWE, CPEs, authentication context, model list, patch version, and exploit-in-the-wild evidence. Treat conclusions outside those facts as assumptions requiring vendor confirmation.

Mitigation direction

  • Check ASUS guidance for affected models, fixed firmware, and supported upgrade paths.
  • Upgrade affected ASUSWRT firmware when a vendor-supported fix is available.
  • Restrict router management access to trusted administrative networks only.
  • Disable unnecessary remote management exposure where operationally feasible.
  • Replace unsupported affected devices if no safe vendor update path exists.

Validation and detection

  • Inventory ASUS routers and record firmware versions, especially ASUSWRT 3.0.0.4.384.20308.
  • Confirm whether router management interfaces are reachable from untrusted networks.
  • Review administrative access logs for unexpected configuration changes or access attempts.
  • Check vendor advisories for model-specific impact and fixed firmware availability.
  • Verify compensating controls limit access to the affected management surface.
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-2018-20334 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.