CVE-2018-20334Public exploitNetwork attack vector

Router takeover via feedback email command injection

Published Mar 20, 2020 · Updated Aug 5, 2024

OS command injection in ASUSWRT 3.0.0.4.384.20308 allows remote attackers to execute commands through a crafted feedback request. The /start_apply.htm POST handler passes the fb_email value containing shell metacharacters into command processing without neutralization. No authentication or user interaction is required, and successful exploitation starts attacker-chosen processes and grants control of the router.

CVSS severity9.8
Critical
EPSS probability3.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in ASUSWRT 3.0.0.4.384.20308 allows remote attackers to execute commands through a crafted feedback request. The /start_apply.htm POST handler passes the fb_email value containing shell metacharacters into command processing without neutralization. No authentication or user interaction is required, and successful exploitation starts attacker-chosen processes and grants control of the router.

The record

CVE
CVE-2018-20334
Published
Mar 20, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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