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
Published Jun 27, 2019
9.1
CRITICALCVSS 3.0
EPSS 43.93%
Description
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.
Affected products
No data.
Configuration 1
- ≤ 4.18\(aaiz.1\)c0
Configuration 2
- ≤ 4.18\(aatd.1\)c0
Configuration 3
- ≤ 4.18\(aapn.1\)c0
Configuration 4
- ≤ 4.33\(aaph.0\)c0
Configuration 5
- ≤ 4.33\(aapi.0\)c0
Configuration 6
- ≤ 4.33\(aapj.0\)c0
Configuration 7
- ≤ 4.33\(aapk.0\)c0
Configuration 8
- ≤ 4.33\(aapl.0\)c0
Configuration 9
- ≤ 4.33\(abae.0\)c0
Running on/with
- n/a
Configuration 10
- ≤ 10.02\(abfv.0\)c0
Running on/with
- n/a
Configuration 11
- ≤ 10.02\(abfc.0\)c0
Running on/with
- n/a
Configuration 12
- ≤ 4.33\(aaaa.0\)c0
Running on/with
- n/a
Configuration 13
- ≤ 4.33\(aaab.0\)c0
Running on/with
- n/a
Configuration 14
- ≤ 4.33\(aaac.0\)c0
Running on/with
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
AV:N/AC:L/Au:N/C:N/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
2021-2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (32 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 43.93% (0.43926) | 98.71th | v5 (v2026.06.15) |
| Sep 22, 2026 | 43.93% (0.43926) | 98.69th | v5 (v2026.06.15) |
| Sep 21, 2026 | 29.52% (0.29523) | 98.15th | v5 (v2026.06.15) |
| Sep 6, 2026 | 43.93% (0.43926) | 98.66th | v5 (v2026.06.15) |
| Sep 5, 2026 | 29.52% (0.29523) | 98.11th | v5 (v2026.06.15) |
| Aug 30, 2026 | 43.93% (0.43926) | 98.65th | v5 (v2026.06.15) |
| Aug 28, 2026 | 29.52% (0.29523) | 98.10th | v5 (v2026.06.15) |
| Aug 24, 2026 | 43.93% (0.43926) | 98.65th | v5 (v2026.06.15) |
| Aug 23, 2026 | 29.52% (0.29523) | 98.09th | v5 (v2026.06.15) |
| Jun 15, 2026 | 43.93% (0.43926) | 98.58th | v5 (v2026.06.15) |
| Jun 13, 2026 | 64.75% (0.64750) | 98.49th | v4 (v2025.03.14) |
| Nov 21, 2025 | 59.06% (0.59063) | 98.12th | v4 (v2025.03.14) |
| Nov 18, 2025 | 51.43% (0.51433) | 97.77th | v4 (v2025.03.14) |
| Mar 30, 2025 | 59.67% (0.59669) | 98.08th | v4 (v2025.03.14) |
| Mar 29, 2025 | 58.44% (0.58441) | 97.41th | v4 (v2025.03.14) |
| Mar 28, 2025 | 59.67% (0.59669) | 98.08th | v4 (v2025.03.14) |
| Mar 26, 2025 | 19.84% (0.19837) | 94.92th | v4 (v2025.03.14) |
| Mar 24, 2025 | 12.12% (0.12123) | 93.18th | v4 (v2025.03.14) |
| Mar 23, 2025 | 19.84% (0.19837) | 94.72th | v4 (v2025.03.14) |
| Mar 18, 2025 | 12.12% (0.12123) | 93.30th | v4 (v2025.03.14) |
| Mar 17, 2025 | 19.84% (0.19837) | 94.98th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.48% (0.00481) | 76.14th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.48% (0.00481) | 75.16th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.48% (0.00481) | 72.13th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.50% (0.04499) | 74.08th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.24% (0.04237) | 74.61th | v1 |
| Jan 6, 2022 | 4.24% (0.04237) | 74.40th | v1 |
| Sep 1, 2021 | 0.98% (0.00976) | 61.78th | v1 |
| Apr 14, 2021 | 0.98% (0.00976) | 0.00th | v1 |
References (2)
- https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/ x_refsource_MISCExploitThird Party Advisory
- https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml x_refsource_CONFIRMPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://n-thumann.de/blog/zyxel-gateways-missing-access-control-in-account-generator-xss/ | x_refsource_MISCExploitThird Party Advisory | |
| https://www.zyxel.com/support/vulnerabilities-related-to-the-Free-Time-feature.shtml | x_refsource_CONFIRMPatchVendor Advisory |
Change history (0)
No recorded changes yet.