CVE-2021-36160Network attack vector

Remote service crash via crafted UWSGI request path

Published Sep 16, 2021 · Updated Aug 4, 2024

Out-of-bounds read in mod_proxy_uwsgi in Apache HTTP Server 2.4.30 through 2.4.48 allows remote attackers to crash server processes. Apache has not published the exact faulty operation beyond mod_proxy_uwsgi reading past allocated memory while processing a crafted URI path. The module must be loaded and configured to proxy UWSGI traffic; the resulting process crash can interrupt service.

CVSS severity7.5
High
EPSS probability62.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds read in mod_proxy_uwsgi in Apache HTTP Server 2.4.30 through 2.4.48 allows remote attackers to crash server processes. Apache has not published the exact faulty operation beyond mod_proxy_uwsgi reading past allocated memory while processing a crafted URI path. The module must be loaded and configured to proxy UWSGI traffic; the resulting process crash can interrupt service.

The record

CVE
CVE-2021-36160
Published
Sep 16, 2021
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache HTTP Server
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2021CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Apache HTTP Server 2.4 <=2.4.48 changes=[{"at":"2.4.30","status":"affected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache HTTP Serverversion=Apache HTTP Server 2.4 <=2.4.48 changes=[{"at":"2.4.30","status":"affected"}]

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

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-125Out-of-bounds Read
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo