What is CVE-2017-18820?

CVE-2017-18820 is a medium-severity vulnerability in NETGEAR Readynas OS, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2020-04-21.

How severe is CVE-2017-18820?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in NETGEAR Readynas OS

CVE-2017-18820

NETGEAR ReadyNAS OS 6 devices running ReadyNAS OS versions prior to 6.8.0 are affected by stored XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-04-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.005 (39.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

NETGEAR Readynas OS

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

kb.netgear.com/000049045/Security-Advisory-for-Stored-Cross-Site-Scripting-on-S… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2017-18820?: CVE-2017-18820 is a medium-severity vulnerability in NETGEAR Readynas OS, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2020-04-21.
How severe is CVE-2017-18820?: Medium severity. CVSS v3 base score is 4.8 out of 10.