CVE-2020-3939Network attack vector

Personal-information exposure via reflected script parameters

Published Feb 4, 2020 · Updated Sep 17, 2024

Reflected XSS in SysJust Syuan-Gu-Da-Shih 20191223 and earlier allows remote attackers to expose personal information through crafted parameters. CHT Security identifies several affected request parameters but does not disclose their names or the output-encoding failure that reflects scripts. Exploitation requires a victim's browser to execute attacker-controlled script; the reported consequence is personal-information exposure.

CVSS severity6.1
Medium
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in SysJust Syuan-Gu-Da-Shih 20191223 and earlier allows remote attackers to expose personal information through crafted parameters. CHT Security identifies several affected request parameters but does not disclose their names or the output-encoding failure that reflects scripts. Exploitation requires a victim's browser to execute attacker-controlled script; the reported consequence is personal-information exposure.

The record

CVE
CVE-2020-3939
Published
Feb 4, 2020
Updated
Sep 17, 2024
Vendor
SysJust
Product
Syuan-Gu-Da-Shih
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=20191223

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SysJust · Syuan-Gu-Da-Shihversion=0 <=20191223

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1TWCERT/CCCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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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