Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall…
Priority HIGH 68CWE-425Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-425.
Summary
Missing Access Control in the "Free Time" component of several Zyxel UAG, USG, and ZyWall devices allows a remote attacker to generate guest accounts by directly accessing the account generator. This can lead to unauthorised network access or Denial of Service.
Why it matters now
EPSS 0.43926 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged 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 · 28
| 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 4.33\(aaph.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg110:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg210_firmware:*:*:*:*:*:*:*:* | up to 4.33\(aapi.0\)c0 | 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 4.33\(aaph.0\)c0 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 4.33\(aapi.0\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg210:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
Show 18 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* | up to 4.33\(aapj.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg310:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg1100_firmware:*:*:*:*:*:*:*:* | up to 4.33\(aapk.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg1100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:usg1900_firmware:*:*:*:*:*:*:*:* | up to 4.33\(aapl.0\)c0 | 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 4.33\(abae.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:usg2200-vpn:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:* | up to 10.02\(abfv.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:zywall_vpn100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:* | up to 10.02\(abfc.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:zywall_vpn300:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:zywall_110_firmware:*:*:*:*:*:*:*:* | up to 4.33\(aaaa.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:zywall_110:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:zywall_310_firmware:*:*:*:*:*:*:*:* | up to 4.33\(aaab.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:zywall_310:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
| cpe:2.3:o:zyxel:zywall_1100_firmware:*:*:*:*:*:*:*:* | up to 4.33\(aaac.0\)c0 | Vulnerable | Zyxel |
| cpe:2.3:h:zyxel:zywall_1100:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Zyxel |
- cpe:2.3:o:zyxel:usg310_firmware:*:*:*:*:*:*:*:* Versions up to 4.33\(aapj.0\)c0 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 4.33\(aapk.0\)c0 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 4.33\(aapl.0\)c0 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 4.33\(abae.0\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:usg2200-vpn:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:* Versions up to 10.02\(abfv.0\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:zywall_vpn100:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:* Versions up to 10.02\(abfc.0\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:zywall_vpn300:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:zywall_110_firmware:*:*:*:*:*:*:*:* Versions up to 4.33\(aaaa.0\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:zywall_110:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:zywall_310_firmware:*:*:*:*:*:*:*:* Versions up to 4.33\(aaab.0\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:zywall_310:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Zyxel
- cpe:2.3:o:zyxel:zywall_1100_firmware:*:*:*:*:*:*:*:* Versions up to 4.33\(aaac.0\)c0 Vulnerable ·Zyxel
- cpe:2.3:h:zyxel:zywall_1100:-:*:*:*:*:*:*:* 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-2019-12583
- 2026-10-03 Alias added: GHSA-cq6f-phq5-pc66
References
More Zyxel Uag2100 Firmware vulnerabilities
- TI-2019-09394 A reflective Cross-site scripting (XSS) vulnerability in the free_time_failed.cgi CGI… CVSS 3.0MEDIUM 6.1
Sources
- CVE-2019-12583 · CVE Program
- CVE-2019-12583 · NVD
- FIRST EPSS
- GHSA-cq6f-phq5-pc66 · 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