Vulnerability Monitor

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CVE-2021-40438


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.


Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.0, indicating it can be exploited remotely over the network but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 40 products from resf, from redhat, from redhat and 37 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.


Published

2021-09-16T15:15:07.633

Last Modified

2025-10-27T17:37:06.747

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 9.0 (CRITICAL)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

8.6

Impact Score

6.4

Weaknesses
  • Type: Secondary
    CWE-918
  • Type: Primary
    CWE-918

Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System resf rocky_linux 8.0 Yes
Operating System redhat enterprise_linux 8.0 Yes
Operating System redhat enterprise_linux_eus 8.1 Yes
Operating System redhat enterprise_linux_eus 8.2 Yes
Operating System redhat enterprise_linux_eus 8.4 Yes
Operating System redhat enterprise_linux_eus 8.6 Yes
Operating System redhat enterprise_linux_eus 8.8 Yes
Operating System redhat enterprise_linux_for_arm_64 8.0 Yes
Operating System redhat enterprise_linux_for_arm_64_eus 8.6 Yes
Operating System redhat enterprise_linux_for_arm_64_eus 8.8 Yes
Operating System redhat enterprise_linux_for_ibm_z_systems 7.0_s390x Yes
Operating System redhat enterprise_linux_for_ibm_z_systems 8.0 Yes
Operating System redhat enterprise_linux_for_ibm_z_systems_eus 8.1 Yes
Operating System redhat enterprise_linux_for_ibm_z_systems_eus 8.4 Yes
Operating System redhat enterprise_linux_for_ibm_z_systems_eus 8.8 Yes
Operating System redhat enterprise_linux_for_ibm_z_systems_eus_s390x 8.2 Yes
Operating System redhat enterprise_linux_for_power_big_endian 7.0 Yes
Operating System redhat enterprise_linux_for_power_little_endian 7.0 Yes
Operating System redhat enterprise_linux_for_power_little_endian 8.0 Yes
Operating System redhat enterprise_linux_for_power_little_endian_eus 8.1 Yes
Operating System redhat enterprise_linux_for_power_little_endian_eus 8.2 Yes
Operating System redhat enterprise_linux_for_power_little_endian_eus 8.4 Yes
Operating System redhat enterprise_linux_for_power_little_endian_eus 8.6 Yes
Operating System redhat enterprise_linux_for_power_little_endian_eus 8.8 Yes
Operating System redhat enterprise_linux_for_scientific_computing 7.0 Yes
Operating System redhat enterprise_linux_server 7.0 Yes
Operating System redhat enterprise_linux_server_aus 7.2 Yes
Operating System redhat enterprise_linux_server_aus 7.3 Yes
Operating System redhat enterprise_linux_server_aus 7.4 Yes
Operating System redhat enterprise_linux_server_aus 7.6 Yes
Operating System redhat enterprise_linux_server_aus 7.7 Yes
Operating System redhat enterprise_linux_server_aus 8.2 Yes
Operating System redhat enterprise_linux_server_aus 8.4 Yes
Operating System redhat enterprise_linux_server_aus 8.6 Yes
Operating System redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 7.6 Yes
Operating System redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 7.7 Yes
Operating System redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.1 Yes
Operating System redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.2 Yes
Operating System redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.4 Yes
Operating System redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.6 Yes
Operating System redhat enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions 8.8 Yes
Operating System redhat enterprise_linux_server_tus 7.6 Yes
Operating System redhat enterprise_linux_server_tus 7.7 Yes
Operating System redhat enterprise_linux_server_tus 8.2 Yes
Operating System redhat enterprise_linux_server_tus 8.4 Yes
Operating System redhat enterprise_linux_server_tus 8.6 Yes
Operating System redhat enterprise_linux_server_tus 8.8 Yes
Operating System redhat enterprise_linux_server_update_services_for_sap_solutions 7.6 Yes
Operating System redhat enterprise_linux_server_update_services_for_sap_solutions 7.7 Yes
Operating System redhat enterprise_linux_update_services_for_sap_solutions 8.1 Yes
Operating System redhat enterprise_linux_update_services_for_sap_solutions 8.2 Yes
Operating System redhat enterprise_linux_update_services_for_sap_solutions 8.4 Yes
Operating System redhat enterprise_linux_update_services_for_sap_solutions 8.6 Yes
Operating System redhat enterprise_linux_update_services_for_sap_solutions 8.8 Yes
Operating System redhat enterprise_linux_workstation 7.0 Yes
Application redhat jboss_core_services 1.0 Yes
Operating System redhat enterprise_linux 7.0 No
Operating System redhat enterprise_linux 8.0 No
Application redhat software_collections 1.0 Yes
Operating System redhat enterprise_linux_server 7.0 No
Operating System redhat enterprise_linux_server_workstation 7.0 No
Application apache http_server ≤ 2.4.48 Yes
Operating System fedoraproject fedora 34 Yes
Operating System fedoraproject fedora 35 Yes
Operating System debian debian_linux 9.0 Yes
Operating System debian debian_linux 10.0 Yes
Operating System debian debian_linux 11.0 Yes
Application netapp cloud_backup - Yes
Application netapp clustered_data_ontap - Yes
Application netapp storagegrid - Yes
Operating System broadcom brocade_fabric_operating_system_firmware - Yes
Operating System f5 f5os ≤ 1.1.4 Yes
Operating System f5 f5os ≤ 1.2.1 Yes
Application oracle enterprise_manager_ops_center 12.4.0.0 Yes
Application oracle http_server 12.2.1.3.0 Yes
Application oracle http_server 12.2.1.4.0 Yes
Application oracle instantis_enterprisetrack 17.1 Yes
Application oracle instantis_enterprisetrack 17.2 Yes
Application oracle instantis_enterprisetrack 17.3 Yes
Application oracle secure_global_desktop 5.6 Yes
Application oracle zfs_storage_appliance_kit 8.8 Yes
Application siemens ruggedcom_nms * Yes
Application siemens sinec_nms < 1.0.3 Yes
Application siemens sinema_remote_connect_server < 3.1 Yes
Application siemens sinema_remote_connect_server 3.2 Yes
Application siemens sinema_server 14.0 Yes
Application tenable tenable.sc ≤ 5.19.1 Yes

References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For resf's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.