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TI-2021-19915 Aliases CVE-2021-44224GHSA-92ww-hwmg-qq7p

Possible NULL dereference or SSRF in forward proxy configurations in Apache HTTP Server 2.4.51 and earlier

Priority HIGH 76CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · Low · High
Fix status
Partial Red Hat: 6 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

A crafted URI sent to httpd configured as a forward proxy (ProxyRequests on) can cause a crash (NULL pointer dereference) or, for configurations mixing forward and reverse proxy declarations, can allow for requests to be directed to a declared Unix Domain Socket endpoint (Server Side Request Forgery). This issue affects Apache HTTP Server 2.4.7 up to 2.4.51 (included).

Why it matters now

EPSS 0.82295 99th percentileScored 2026-11-07
Fix Partial Red Hat: 4 advisoriesRed Hat: 6 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache HTTP Server2.4.7 and later—No fix listedCNA
  • Apache HTTP Server VendorApache Affected 2.4.7 and later Fixed in — No fix listed CNA

CPE configurations NVD · 34

CPEVersionsRoleVendor
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*2.4.7 to before 2.4.52VulnerableApache
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*35VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*36VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*5.14.0 to before 5.20.0; 5.16.0 to before 202201.1VulnerableTenable
cpe:2.3:a:oracle:communications_element_manager:*:*:*:*:*:*:*:*before 9.0VulnerableOracle
cpe:2.3:a:oracle:communications_operations_monitor:4.0:*:*:*:*:*:*:*4.0VulnerableOracle
cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:*4.3VulnerableOracle
  • cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* Versions 2.4.7 to before 2.4.52 Vulnerable ·Apache
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
  • cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:* Versions 5.14.0 to before 5.20.0; 5.16.0 to before 202201.1 Vulnerable ·Tenable
  • cpe:2.3:a:oracle:communications_element_manager:*:*:*:*:*:*:*:* Versions before 9.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_operations_monitor:4.0:*:*:*:*:*:*:* Versions 4.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_operations_monitor:4.3:*:*:*:*:*:*:* Versions 4.3 Vulnerable ·Oracle
Show 24 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:*4.4VulnerableOracle
cpe:2.3:a:oracle:communications_operations_monitor:5.0:*:*:*:*:*:*:*5.0VulnerableOracle
cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:*before 9.0VulnerableOracle
cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:*before 9.0VulnerableOracle
cpe:2.3:a:oracle:http_server:-:*:*:*:*:*:*:*not specified by NVDVulnerableOracle
cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*12.2.1.3.0VulnerableOracle
cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*12.2.1.4.0VulnerableOracle
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*17.1VulnerableOracle
cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*17.2VulnerableOracle
cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*17.3VulnerableOracle
cpe:2.3:o:apple:mac_os_x:10.15.7:*:*:*:*:*:*:*10.15.7VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:*10.15.7 security_update_2020-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:*10.15.7 security_update_2021-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:*10.15.7 security_update_2021-002VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:*10.15.7 security_update_2021-003VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:*10.15.7 security_update_2021-004VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:*10.15.7 security_update_2021-005VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:*10.15.7 security_update_2021-006VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:*10.15.7 security_update_2021-007VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008:*:*:*:*:*:*10.15.7 security_update_2021-008VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001:*:*:*:*:*:*10.15.7 security_update_2022-001VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-002:*:*:*:*:*:*10.15.7 security_update_2022-002VulnerableApple
cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003:*:*:*:*:*:*10.15.7 security_update_2022-003VulnerableApple
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*before 10.15.7; 11.0 to before 11.6.6; 12.0.0 to before 12.4VulnerableApple
  • cpe:2.3:a:oracle:communications_operations_monitor:4.4:*:*:*:*:*:*:* Versions 4.4 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_operations_monitor:5.0:*:*:*:*:*:*:* Versions 5.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:* Versions before 9.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:* Versions before 9.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:http_server:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Oracle
  • cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:* Versions 12.2.1.3.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:* Versions 12.2.1.4.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:* Versions 17.1 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:* Versions 17.2 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:* Versions 17.3 Vulnerable ·Oracle
  • cpe:2.3:o:apple:mac_os_x:10.15.7:*:*:*:*:*:*:* Versions 10.15.7 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2020-001:*:*:*:*:*:* Versions 10.15.7 security_update_2020-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-001:*:*:*:*:*:* Versions 10.15.7 security_update_2021-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-002:*:*:*:*:*:* Versions 10.15.7 security_update_2021-002 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-003:*:*:*:*:*:* Versions 10.15.7 security_update_2021-003 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-004:*:*:*:*:*:* Versions 10.15.7 security_update_2021-004 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-005:*:*:*:*:*:* Versions 10.15.7 security_update_2021-005 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-006:*:*:*:*:*:* Versions 10.15.7 security_update_2021-006 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-007:*:*:*:*:*:* Versions 10.15.7 security_update_2021-007 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2021-008:*:*:*:*:*:* Versions 10.15.7 security_update_2021-008 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-001:*:*:*:*:*:* Versions 10.15.7 security_update_2022-001 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-002:*:*:*:*:*:* Versions 10.15.7 security_update_2022-002 Vulnerable ·Apple
  • cpe:2.3:o:apple:mac_os_x:10.15.7:security_update_2022-003:*:*:*:*:*:* Versions 10.15.7 security_update_2022-003 Vulnerable ·Apple
  • cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 10.15.7; 11.0 to before 11.6.6; 12.0.0 to before 12.4 Vulnerable ·Apple

Remediation

Red Hat 4 advisories

  • RHSA-2022:7143 Released 2022-10-26 · Red Hat rating Moderate
    Red Hat JBoss Core Services Apache HTTP Server 2.4.51 security update
    • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd-2.4.51-28.el7jbcs, jbcs-httpd24-httpd-devel-2.4.51-28.el7jbcs, jbcs-httpd24-httpd-manual-2.4.51-28.el7jbcs +6
    • Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd-2.4.51-28.el8jbcs, jbcs-httpd24-httpd-devel-2.4.51-28.el8jbcs, jbcs-httpd24-httpd-manual-2.4.51-28.el8jbcs +6
  • RHSA-2022:7144 Released 2022-10-26 · Red Hat rating Important
    Red Hat JBoss Core Services Apache HTTP Server 2.4.51 security update
    • Red Hat JBoss Core Services
  • RHSA-2022:6753 Released 2022-09-29 · Red Hat rating Moderate
    httpd24-httpd security and bug fix update
    • Red Hat Software Collections for RHEL Workstation(v. 7) httpd24-httpd-2.4.34-23.el7.5, httpd24-httpd-devel-2.4.34-23.el7.5, httpd24-httpd-manual-2.4.34-23.el7.5 +5
    • Red Hat Software Collections for RHEL(v. 7) httpd24-httpd-2.4.34-23.el7.5, httpd24-httpd-devel-2.4.34-23.el7.5, httpd24-httpd-manual-2.4.34-23.el7.5 +5
Show 1 more Red Hat advisories
  • RHSA-2022:1915 Released 2022-05-10 · Red Hat rating Moderate
    httpd:2.4 security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 8) httpd-2.4.37-47.module+el8.6.0+14529+083145da.1.aarch64::httpd:2.4, httpd-2.4.37-47.module+el8.6.0+14529+083145da.1.ppc64le::httpd:2.4, httpd-2.4.37-47.module+el8.6.0+14529+083145da.1.s390x::httpd:2.4 +38

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Apache HTTP Server — FEDORA-2021-29a536c2ae

    2 records Highest priority Priority CRITICAL 1 CRITICAL, 1 HIGH

    Other records, highest priority first

    • TI-2021-20274 Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlierPriority CRITICAL 86
    Show all 2 records → Advisory →
  • Advisory ·

    Apache HTTP Server — DSA-5035

    2 records Highest priority Priority CRITICAL 1 CRITICAL, 1 HIGH

    Other records, highest priority first

    • TI-2021-20274 Possible buffer overflow when parsing multipart content in mod_lua of Apache HTTP Server 2.4.51 and earlierPriority CRITICAL 86
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat JBoss Enterprise Application Platform 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:1915
Red Hat JBoss Core ServicesFixed RHSA-2022:7144
Red Hat JBoss Core Services on RHEL 7 ServerFixed RHSA-2022:7143
Red Hat JBoss Core Services on RHEL 8Fixed RHSA-2022:7143
Red Hat Software Collections for RHEL Workstation(v. 7)Fixed RHSA-2022:6753
Red Hat Software Collections for RHEL(v. 7)Fixed RHSA-2022:6753
Not affected: 5 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 9
  • Red Hat JBoss Core Services on RHEL 7 Server
  • Red Hat JBoss Core Services on RHEL 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-44224
  2. 2026-10-03 Alias added: GHSA-92ww-hwmg-qq7p
  3. 2026-10-09 Fix available: RHSA-2022:7144 · Red Hat
  4. 2026-10-09 Fix available: Red Hat JBoss Core Services · Red Hat

References

Patch 2

Advisory 17

  • TI-2021-18535 Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773) KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-18417 Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-25716 Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path. KEVCVSS 3.1CRITICAL 9.1
  • TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
  • TI-2019-00184 Use after free in Apache HTTP Server KEVCVSS 3.1HIGH 7.8
  • TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
See all 349 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences