In OpenResty through 1.13.6.1, URI parameters are obtained using the ngx.req.get_uri_args and ngx.req.get_post_args functions that ignore parameters beyond the hundredth one, which might allow remote attackers to bypass intended access restrictions or interfere with certain Web Application Firewall (ngx_lua_waf or X-WAF) products
Published Apr 2, 2018
9.8
CRITICALCVSS 3.0
EPSS 13.24%
Description
In OpenResty through 1.13.6.1, URI parameters are obtained using the ngx.req.get_uri_args and ngx.req.get_post_args functions that ignore parameters beyond the hundredth one, which might allow remote attackers to bypass intended access restrictions or interfere with certain Web Application Firewall (ngx_lua_waf or X-WAF) products. NOTE: the vendor has reported that 100 parameters is an intentional default setting, but is adjustable within the API. The vendor's position is that a security-relevant misuse of the API by a WAF product is a vulnerability in the WAF product, not a vulnerability in OpenResty
Affected products
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:H/I:H/A:H
AV:N/AC:L/Au:N/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 1, 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 (28 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 13.24% (0.13237) | 96.27th | v5 (v2026.06.15) |
| Sep 22, 2026 | 13.24% (0.13237) | 96.20th | v5 (v2026.06.15) |
| Sep 21, 2026 | 6.07% (0.06072) | 93.14th | v5 (v2026.06.15) |
| Sep 20, 2026 | 13.24% (0.13237) | 96.20th | v5 (v2026.06.15) |
| Sep 6, 2026 | 13.48% (0.13480) | 96.18th | v5 (v2026.06.15) |
| Sep 5, 2026 | 6.11% (0.06112) | 93.04th | v5 (v2026.06.15) |
| Aug 30, 2026 | 13.48% (0.13480) | 96.16th | v5 (v2026.06.15) |
| Aug 28, 2026 | 6.11% (0.06112) | 93.00th | v5 (v2026.06.15) |
| Aug 24, 2026 | 13.48% (0.13480) | 96.14th | v5 (v2026.06.15) |
| Aug 23, 2026 | 6.11% (0.06112) | 92.97th | v5 (v2026.06.15) |
| Jun 15, 2026 | 13.68% (0.13683) | 95.99th | v5 (v2026.06.15) |
| Oct 27, 2025 | 41.89% (0.41888) | 97.27th | v4 (v2025.03.14) |
| Sep 4, 2025 | 43.02% (0.43015) | 97.41th | v4 (v2025.03.14) |
| Sep 1, 2025 | 37.74% (0.37744) | 97.11th | v4 (v2025.03.14) |
| Aug 4, 2025 | 43.02% (0.43015) | 97.37th | v4 (v2025.03.14) |
| Aug 1, 2025 | 37.74% (0.37744) | 97.08th | v4 (v2025.03.14) |
| Mar 17, 2025 | 43.85% (0.43848) | 97.22th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.64% (0.00637) | 79.37th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.64% (0.00637) | 78.49th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.64% (0.00637) | 75.88th | 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 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.83% (0.00833) | 24.94th | v1 |
| Jan 6, 2022 | 0.83% (0.00833) | 24.32th | v1 |
| Sep 1, 2021 | 0.83% (0.00833) | 58.25th | v1 |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (2)
- https://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty.md x_refsource_MISCExploitThird Party Advisory
- https://openresty.org/en/changelog-1013006.html x_refsource_MISCVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty.md | x_refsource_MISCExploitThird Party Advisory | |
| https://openresty.org/en/changelog-1013006.html | x_refsource_MISCVendor Advisory |
Change history (0)
No recorded changes yet.