What is CVE-2020-3939?

CVE-2020-3939 is a medium-severity vulnerability in Changing Syuan-Gu-Da-Shih, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-02-04.

How severe is CVE-2020-3939?

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

XSS in Changing Syuan-Gu-Da-Shih

CVE-2020-3939

SysJust Syuan-Gu-Da-Shih, versions before 20191223, contain vulnerability of Cross-Site Scripting(XSS), personal information may be leaked to attackers via the vulnerability.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-02-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Changing Syuan-Gu-Da-Shih — versions 0
Sysjust Syuan-Gu-Da-Shin

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

tvn.twcert.org.tw/taiwanvn/TVN-201910015 (Third Party Advisory)
www.chtsecurity.com/news/a791f509-9782-4be1-b71f-22fc619f8215 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-3939?: CVE-2020-3939 is a medium-severity vulnerability in Changing Syuan-Gu-Da-Shih, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-02-04.
How severe is CVE-2020-3939?: Medium severity. CVSS v3 base score is 6.1 out of 10.