CVE-2019-12581

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

6.1 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

6.40%Up 5.0 points since Apr 14, 2021

What each source reports

NVD Score used 6.1

Record: CVE-2019-12581
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

Record: CVE-2019-12581
Updated: 2026-11-02

EUVDEUVD-2019-4175 No score

Record: EUVD-2019-4175
Updated: 2026-11-03

GitHub AdvisoriesGHSA-5f8r-3j92-cp9m 6.1

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

Record: GHSA-5f8r-3j92-cp9m
CVSS 3.0: 6.1 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

Affected products

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Nuclei	Zyxel ZyWal/USG/UAG Devices - Cross-Site Scripting

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, Nuclei, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-12581 is a medium vulnerability (CVSS 6.1) in Zyxel Uag2100 Firmware, published June 27, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 6.40%, the 93rd percentile. No source names a fixed version.