What is CVE-2018-17021?

CVE-2018-17021 is a medium-severity vulnerability in ASUS Gt-Ac5300, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-09-13.

How severe is CVE-2018-17021?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2018-17021 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in ASUS Gt-Ac5300

CVE-2018-17021

Cross-site scripting (XSS) vulnerability on ASUS GT-AC5300 devices with firmware through 3.0.0.4.384_32738 allows remote attackers to inject arbitrary web script or HTML via the appGet.cgi hook parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-09-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (65.0th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

PAGalaxyLab/VulInfo

References

github.com/PAGalaxyLab/VulInfo/blob/master/ASUS/ac5300_xss/ASUS GT-AC5300 XSS.MD (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-17021?: CVE-2018-17021 is a medium-severity vulnerability in ASUS Gt-Ac5300, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-09-13.
How severe is CVE-2018-17021?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2018-17021 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.