Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RMerl/asuswrt-merlin) allows web authenticated attackers to execute code via a request that updates a setting
Published Jan 17, 2018
8.8
HIGHCVSS 3.1
EPSS 1.94%
Description
Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RMerl/asuswrt-merlin) allows web authenticated attackers to execute code via a request that updates a setting. In ej_update_variables, the length of the variable action_script is not checked, as long as it includes a "_wan_if" substring.
Affected products
No data.
- ≤ 382.1_2
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:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:S/C:P/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 3, 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 (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 1.94% (0.01938) | 79.40th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.95% (0.01951) | 77.54th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.82% (0.01816) | 81.23th | v4 (v2025.03.14) |
| Mar 29, 2025 | 5.19% (0.05189) | 82.81th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.82% (0.01816) | 81.64th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.10% (0.00101) | 41.93th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.10% (0.00101) | 41.90th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.10% (0.00101) | 39.88th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.60% (0.01599) | 75.52th | v2 (v2022.01.01) |
| Feb 16, 2023 | 1.60% (0.01599) | 75.05th | v2 (v2022.01.01) |
| Dec 13, 2022 | 1.30% (0.01298) | 67.78th | v2 (v2022.01.01) |
| Oct 14, 2022 | 1.19% (0.01190) | 60.73th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.09% (0.01086) | 51.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.09% (0.01086) | 49.83th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.09% (0.01086) | 28.42th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.78% (0.00776) | 21.05th | v1 |
| Jan 6, 2022 | 0.78% (0.00776) | 20.47th | v1 |
| Sep 1, 2021 | 0.78% (0.00776) | 49.72th | v1 |
| Apr 14, 2021 | 0.78% (0.00776) | 0.00th | v1 |
References (1)
- http://www.w0lfzhang.com/2018/01/17/ASUS-router-stack-overflow-in-http-server/ x_refsource_MISCExploitThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.w0lfzhang.com/2018/01/17/ASUS-router-stack-overflow-in-http-server/ | x_refsource_MISCExploitThird Party Advisory |
Change history (0)
No recorded changes yet.