CVE-2018-9230

Name: CVE-2018-9230
Creator: NVD / NIST
Published: 2018-04-02T18:29:00.233+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 13.68%

Last modified Jun 17, 2026

CVE-2018-9230 is a vulnerability of currently unknown severity. 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. EPSS estimates a 13.68% chance of exploitation in the next 30 days.

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

Metrics

EPSS Probability

13.68%

96.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-89

Affected Software

Vendor	Product	Versions
Openresty	Openresty	< 1.13.6.1

References

https://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty.mdExploit, Third Party Advisory
https://openresty.org/en/changelog-1013006.htmlVendor Advisory
https://github.com/Bypass007/vuln/blob/master/OpenResty/Uri%20parameter%20overflow%20in%20Openresty.mdExploit, Third Party Advisory
https://openresty.org/en/changelog-1013006.htmlVendor Advisory

Timeline

Published: Apr 2, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-9230?

How severe is CVE-2018-9230?

Severity scoring for CVE-2018-9230 is pending analysis. The EPSS model estimates a 13.68% probability of exploitation in the next 30 days.

How do I fix CVE-2018-9230?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-9230?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST