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CVE-2021-40438

CRITICALCISA KEV

9.0

Description

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.

CVE Details

CVSS v3.1 Score9.0

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published9/16/2021

Last Modified10/27/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorApache

ProductApache

Vulnerability NameApache HTTP Server-Side Request Forgery (SSRF)

KEV Date Added2021-12-01

Remediation Due Date2021-12-15

Ransomware UseUnknown

Affected Products

apache:http_serverbroadcom:brocade_fabric_operating_system_firmwaredebian:debian_linuxf5:f5osfedoraproject:fedoranetapp:cloud_backupnetapp:clustered_data_ontapnetapp:storagegridoracle:enterprise_manager_ops_centeroracle:http_serveroracle:instantis_enterprisetrackoracle:secure_global_desktoporacle:zfs_storage_appliance_kitredhat:enterprise_linuxredhat:enterprise_linux_eusredhat:enterprise_linux_for_arm_64redhat:enterprise_linux_for_arm_64_eusredhat:enterprise_linux_for_ibm_z_systemsredhat:enterprise_linux_for_ibm_z_systems_eusredhat:enterprise_linux_for_ibm_z_systems_eus_s390xredhat:enterprise_linux_for_power_big_endianredhat:enterprise_linux_for_power_little_endianredhat:enterprise_linux_for_power_little_endian_eusredhat:enterprise_linux_for_scientific_computingredhat:enterprise_linux_serverredhat:enterprise_linux_server_ausredhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutionsredhat:enterprise_linux_server_tusredhat:enterprise_linux_server_update_services_for_sap_solutionsredhat:enterprise_linux_server_workstationredhat:enterprise_linux_update_services_for_sap_solutionsredhat:enterprise_linux_workstationredhat:jboss_core_servicesredhat:software_collectionsresf:rocky_linuxsiemens:ruggedcom_nmssiemens:sinec_nmssiemens:sinema_remote_connect_serversiemens:sinema_servertenable:tenable.sc

Weaknesses (CWE)

CWE-918CWE-918

References

https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf(security@apache.org)

https://httpd.apache.org/security/vulnerabilities_24.html(security@apache.org)

https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E(security@apache.org)

https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E(security@apache.org)

https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E(security@apache.org)

https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E(security@apache.org)

https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E(security@apache.org)

https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E(security@apache.org)

https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3E(security@apache.org)

https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html(security@apache.org)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/(security@apache.org)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/(security@apache.org)

https://security.gentoo.org/glsa/202208-20(security@apache.org)

https://security.netapp.com/advisory/ntap-20211008-0004/(security@apache.org)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ(security@apache.org)

https://www.debian.org/security/2021/dsa-4982(security@apache.org)

https://www.oracle.com/security-alerts/cpuapr2022.html(security@apache.org)

https://www.oracle.com/security-alerts/cpujan2022.html(security@apache.org)

https://www.tenable.com/security/tns-2021-17(security@apache.org)

https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf(af854a3a-2127-422b-91ae-364da2661108)

https://httpd.apache.org/security/vulnerabilities_24.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E(af854a3a-2127-422b-91ae-364da2661108)

https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E(af854a3a-2127-422b-91ae-364da2661108)

https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E(af854a3a-2127-422b-91ae-364da2661108)

https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E(af854a3a-2127-422b-91ae-364da2661108)

https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E(af854a3a-2127-422b-91ae-364da2661108)

https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E(af854a3a-2127-422b-91ae-364da2661108)

https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3E(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/(af854a3a-2127-422b-91ae-364da2661108)

https://security.gentoo.org/glsa/202208-20(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20211008-0004/(af854a3a-2127-422b-91ae-364da2661108)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ(af854a3a-2127-422b-91ae-364da2661108)

https://www.debian.org/security/2021/dsa-4982(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpuapr2022.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.oracle.com/security-alerts/cpujan2022.html(af854a3a-2127-422b-91ae-364da2661108)

https://www.tenable.com/security/tns-2021-17(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-40438(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.