Exploited
critical
9
CWE
918
Advisory Published
CVE Published
Updated

CVE-2021-40438: mod_proxy SSRF

First published: Thu Sep 16 2021(Updated: )

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.

Credit: security@apache.org security@apache.org

Affected SoftwareAffected VersionHow to fix
redhat/jbcs-httpd24-httpd<0:2.4.37-76.el8
0:2.4.37-76.el8
redhat/jbcs-httpd24-httpd<0:2.4.37-76.jbcs.el7
0:2.4.37-76.jbcs.el7
redhat/httpd<0:2.4.6-97.el7_9.1
0:2.4.6-97.el7_9.1
redhat/httpd<0:2.4.6-40.el7_2.7
0:2.4.6-40.el7_2.7
redhat/httpd<0:2.4.6-45.el7_3.6
0:2.4.6-45.el7_3.6
redhat/httpd<0:2.4.6-67.el7_4.7
0:2.4.6-67.el7_4.7
redhat/httpd<0:2.4.6-89.el7_6.2
0:2.4.6-89.el7_6.2
redhat/httpd<0:2.4.6-90.el7_7.1
0:2.4.6-90.el7_7.1
redhat/httpd24-httpd<0:2.4.34-22.el7.1
0:2.4.34-22.el7.1
debian/apache2
2.4.38-3+deb10u8
2.4.38-3+deb10u10
2.4.56-1~deb11u2
2.4.56-1~deb11u1
2.4.57-2
2.4.57-3
2.4.58-1
redhat/httpd<2.4.49
2.4.49
Apache HTTP Server
Apache HTTP Server<=2.4.48
Fedora=34
Fedora=35
Debian=9.0
Debian=10.0
Debian=11.0
NetApp Cloud Backup
IBM Data ONTAP
NetApp StorageGrid
F5 F5OS>=1.1.0<=1.1.4
F5 F5OS>=1.2.0<=1.2.1
Oracle Enterprise Manager Ops Center=12.4.0.0
Oracle HTTP Server=12.2.1.3.0
Oracle HTTP Server=12.2.1.4.0
Oracle Instantis EnterpriseTrack=17.1
Oracle Instantis EnterpriseTrack=17.2
Oracle Instantis EnterpriseTrack=17.3
Tarantella Secure Global Desktop=5.6
Oracle Storage Cloud Software Appliance=8.8
Siemens SINEC NMS SP1 Update 1
Siemens SINEMA Server SP3=14.0
Broadcom Fabric Operating System
Siemens Ruggedcom NMS
Siemens SINEC NMS SP1 Update 1<1.0.3
Siemens SINEMA Remote Connect<3.1
Siemens SINEMA Remote Connect=3.2
Tenable.sc<=5.19.1

Remedy

https://www.oracle.com/security-alerts/cpuapr2022.html

Remedy

https://www.oracle.com/security-alerts/cpujan2022.html

Remedy

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-40438?

    CVE-2021-40438 is a Server-Side Request Forgery (SSRF) vulnerability found in Apache HTTP Server (httpd) that allows a remote attacker to make the server forward requests to an arbitrary server.

  • How severe is CVE-2021-40438?

    CVE-2021-40438 has a severity level of critical, with a CVSS score of 9.0.

  • Which software versions are affected by CVE-2021-40438?

    CVE-2021-40438 affects Apache HTTP Server (httpd) versions up to and including 2.4.49.

  • How can I fix CVE-2021-40438?

    To fix CVE-2021-40438, upgrade to Apache HTTP Server (httpd) version 2.4.49 or apply the recommended patches provided by your software vendor.

  • Where can I find more information about CVE-2021-40438?

    You can find more information about CVE-2021-40438 on the Apache HTTP Server security vulnerabilities page and the Red Hat Bugzilla page.

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