A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI…
Priority LOW 37CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
EPSS 0.064 93rd percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 18
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:uag2100_firmware:*:*:*:*:*:*:*:* | up to 4.18\(aaiz.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:uag2100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:uag4100_firmware:*:*:*:*:*:*:*:* | up to 4.18\(aatd.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:uag4100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:uag5100_firmware:*:*:*:*:*:*:*:* | up to 4.18\(aapn.1\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:uag5100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg110_firmware:*:*:*:*:*:*:*:* | up to 4.30 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:* | up to 4.30 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:uag2100_firmware:*:*:*:*:*:*:*:* Versions up to 4.18\(aaiz.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:uag2100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:uag4100_firmware:*:*:*:*:*:*:*:* Versions up to 4.18\(aatd.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:uag4100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:uag5100_firmware:*:*:*:*:*:*:*:* Versions up to 4.18\(aapn.1\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:uag5100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg110_firmware:*:*:*:*:*:*:*:* Versions up to 4.30 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:* Versions up to 4.30 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Show 8 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* | up to 4.30 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:* | up to 4.30 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:* | up to 4.30 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg2200-vpn_firmware:*:*:*:*:*:*:*:* | up to 4.30 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg2200-vpn:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* Versions up to 4.30 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:* Versions up to 4.30 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:* Versions up to 4.30 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg1900:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:usg2200-vpn_firmware:*:*:*:*:*:*:*:* Versions up to 4.30 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg2200-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-12581
- 2026-10-03 Alias added: GHSA-5f8r-3j92-cp9m
References
Exploit 2
Advisory 1
More Zyxel Uag2100 Firmware vulnerabilities
- TI-2019-09395 Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall… CVSS 3.0CRITICAL 9.1
Sources
- CVE-2019-12581 · CVE Program
- CVE-2019-12581 · NVD
- FIRST EPSS
- GHSA-5f8r-3j92-cp9m · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences