CVE-2018-9230
9.8
CRITICAL · CVSS 3.0 · EPSS 13.2% (pctl 96)
Patch early
EPSS 13.2% — above the 10% action threshold.
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
Scoring
| CVSS | 9.8 (CRITICAL, v3.0) |
|---|---|
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 13.24% — more likely to be exploited than 96% of all CVEs |
| Weakness | CWE-89 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2018-04-02 |
| Last modified | 2026-06-17 |
Affected (1)
| Vendor | Product |
|---|---|
| openresty | openresty |
References
- https://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty.md
- https://openresty.org/en/changelog-1013006.html
- https://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty.md
- https://openresty.org/en/changelog-1013006.html
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