Home/CVE/A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall,
CVE

CVE-2019-12581

A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall,

A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI program in selected Zyxel ZyWall, USG, and UAG devices allows remote attackers to inject arbitrary web script or HTML via the err_msg parameter.

MEDIUM · CVSS 6.1 EPSS 0.28984
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 3% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

9
zyxel uag2100 firmware<= 4.18\(aaiz.1\)c0
zyxel uag4100 firmware<= 4.18\(aatd.1\)c0
zyxel uag5100 firmware<= 4.18\(aapn.1\)c0
zyxel usg110 firmware<= 4.30
zyxel usg210 firmware<= 4.30
zyxel usg310 firmware<= 4.30
zyxel usg1100 firmware<= 4.30
zyxel usg1900 firmware<= 4.30
⚠

Public Exploits & PoCs

3
nucleiZyxel ZyWal/USG/UAG Devices - Cross-Site Scriptingmedium
pocn-thumann.de · zyxel-gateways-missing-access-control-in-account-generato...n-thumann.de
pocsec-consult.com · index.htmlsec-consult.com
▣

Scoring & Timeline

6.1
MEDIUM · CVSS v3.0 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Jun 2019 · 03:15 PM
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtmlPatchVendor Advisory
https://www.zyxel.com/us/en/Vendor Advisory
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