CVE-2020-11724Network attack vector

Request smuggling via inconsistent subrequest body framing

Published Apr 12, 2020 · Updated Aug 4, 2024

HTTP request smuggling in OpenResty before 1.15.8.4 allows remote attackers to alter downstream requests via ngx.location.capture. ngx_http_lua_subrequest.c copied parent request headers while separately replacing the subrequest body and its Content-Length, creating inconsistent framing for chunked requests. Exploitation requires a reachable Lua handler that invokes the affected API; the published assessment limits the direct impact to downstream request integrity.

CVSS severity7.5
High
EPSS probability2.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in OpenResty before 1.15.8.4 allows remote attackers to alter downstream requests via ngx.location.capture. ngx_http_lua_subrequest.c copied parent request headers while separately replacing the subrequest body and its Content-Length, creating inconsistent framing for chunked requests. Exploitation requires a reachable Lua handler that invokes the affected API; the published assessment limits the direct impact to downstream request integrity.

The record

CVE
CVE-2020-11724
Published
Apr 12, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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