CVE-2018-20334

Name: CVE-2018-20334
Creator: NVD / NIST
Published: 2020-03-20T01:15:22.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.83%

Last modified Jun 17, 2026

CVE-2018-20334 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 3.83% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.83%

88.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Asus	Asuswrt	3.0.0.4.384.20308

References

https://starlabs.sg/advisories/18-20334/Exploit, Third Party Advisory
https://starlabs.sg/advisories/18-20334/Exploit, Third Party Advisory

Timeline

Published: Mar 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-20334?

How severe is CVE-2018-20334?

CVE-2018-20334 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.83% probability of exploitation in the next 30 days.

How do I fix CVE-2018-20334?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-20334?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST