A cross-site scripting vulnerability was identified in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.35 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.35 through 5.20, and VPN series firmware versions 4.35 through 5.20, that could allow an attacker to obtain some information stored in the user's browser, such as cookies or session tokens, via a malicious script
Published May 24, 2022
6.1
MEDIUMCVSS 3.1
EPSS 9.40%
Description
A cross-site scripting vulnerability was identified in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.35 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.35 through 5.20, and VPN series firmware versions 4.35 through 5.20, that could allow an attacker to obtain some information stored in the user's browser, such as cookies or session tokens, via a malicious script.
Affected products
-
- Version 4.35 through 5.20StatusaffectedConstraints-
- Version
-
- Version 4.50 through 5.20StatusaffectedConstraints-
- Version
-
- Version 4.35 through 4.70StatusaffectedConstraints-
- Version
-
- Version 4.35 through 5.20StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Zyxel | ATP series firmware | n/a |
| ||||||
| Zyxel | USG FLEX series firmware | n/a |
| ||||||
| Zyxel | USG/ZyWALL series firmware | n/a |
| ||||||
| Zyxel | VPN series firmware | n/a |
|
Configuration 1
- ≥ 4.35 · ≤ 5.20
Configuration 2
- ≥ 4.35 · ≤ 5.20
Configuration 3
- ≥ 4.35 · ≤ 5.20
Configuration 4
- ≥ 4.35 · ≤ 5.20
Configuration 5
- ≥ 4.35 · ≤ 5.20
Configuration 6
- ≥ 4.35 · ≤ 5.20
Configuration 7
- ≥ 4.35 · ≤ 5.20
Configuration 8
- ≥ 4.35 · ≤ 5.20
Configuration 9
- ≥ 4.35 · ≤ 5.20
Configuration 10
- ≥ 4.35 · ≤ 5.20
Configuration 11
- ≥ 4.35 · ≤ 4.70
Configuration 12
- ≥ 4.35 · ≤ 4.70
Configuration 13
- ≥ 4.35 · ≤ 4.70
Configuration 14
- ≥ 4.35 · ≤ 4.70
Configuration 15
- ≥ 4.35 · ≤ 4.70
Running on/with
- n/a
Configuration 16
- ≥ 4.35 · ≤ 4.70
Running on/with
- n/a
Configuration 17
- ≥ 4.35 · ≤ 4.70
Configuration 18
- ≥ 4.35 · ≤ 4.70
Configuration 19
- ≥ 4.35 · ≤ 4.70
Configuration 20
- ≥ 4.35 · ≤ 4.70
Configuration 21
- ≥ 4.35 · ≤ 4.70
Configuration 22
- ≥ 4.50 · ≤ 5.20
Running on/with
- n/a
Configuration 23
- ≥ 4.50 · ≤ 5.20
Running on/with
- n/a
Configuration 24
- ≥ 4.50 · ≤ 5.20
Running on/with
- n/a
Configuration 25
- ≥ 4.50 · ≤ 5.20
Running on/with
- n/a
Configuration 26
- ≥ 4.50 · ≤ 5.20
Running on/with
- n/a
Configuration 27
- ≥ 4.35 · ≤ 4.70
Configuration 28
- ≥ 4.35 · ≤ 4.70
Configuration 29
- ≥ 4.35 · ≤ 4.70
Configuration 30
- ≥ 4.35 · ≤ 4.70
Configuration 31
- ≥ 4.35 · ≤ 4.70
Configuration 32
- ≥ 4.35 · ≤ 4.70
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
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 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 9.40% (0.09402) | 95.27th | v5 (v2026.06.15) |
| Oct 1, 2026 | 9.40% (0.09402) | 95.27th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.36% (0.08360) | 94.23th | v5 (v2026.06.15) |
| Sep 15, 2025 | 0.33% (0.00326) | 54.91th | v4 (v2025.03.14) |
| Sep 9, 2025 | 2.94% (0.02936) | 85.90th | v4 (v2025.03.14) |
| Sep 8, 2025 | 4.17% (0.04170) | 88.24th | v4 (v2025.03.14) |
| May 8, 2025 | 17.02% (0.17021) | 94.57th | v4 (v2025.03.14) |
| Mar 30, 2025 | 14.70% (0.14695) | 93.91th | v4 (v2025.03.14) |
| Mar 29, 2025 | 18.11% (0.18110) | 92.05th | v4 (v2025.03.14) |
| Mar 19, 2025 | 14.58% (0.14576) | 93.65th | v4 (v2025.03.14) |
| Mar 17, 2025 | 5.46% (0.05455) | 89.47th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.07% (0.00072) | 33.34th | v3 (v2023.03.01) |
| Jun 13, 2024 | 0.07% (0.00072) | 31.26th | v3 (v2023.03.01) |
| Nov 3, 2023 | 0.07% (0.00070) | 29.25th | v3 (v2023.03.01) |
| May 30, 2023 | 0.06% (0.00063) | 25.22th | v3 (v2023.03.01) |
| Apr 23, 2023 | 0.05% (0.00050) | 16.96th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00046) | 13.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Nov 10, 2022 | 0.89% (0.00885) | 26.90th | v2 (v2022.01.01) |
| May 24, 2022 | 0.89% (0.00885) | 24.87th | v2 (v2022.01.01) |
References (1)
- https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://www.zyxel.com/support/multiple-vulnerabilities-of-firewalls-AP-controllers-and-APs.shtml | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.