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CVE-2021-44224

Affected software8 products, listed below
Severity8.2 High CVSS 3.1 2 scores
WeaknessCWE-476
Published20 Dec 2021
Updated17 Jun 2026

Description

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).

Exploitation status

Forecast only (82% 30-day chance)

No exploit has been reported in the sources we check. EPSS puts this CVE in the top 0.33% of all scored CVEs. That is a model's forecast, not a report of exploitation.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 82% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99.7% of all scored CVEs.

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

8.2 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 8.2 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H NVD Primary published
CVSS 2.0 6.4 none AV:N/AC:L/Au:N/C:N/I:P/A:P NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update April 2022 ↗ CPU 2022-Q2 Oracle Fusion Middleware / SSL Module (Apache HTTP Server) (12.2.1.3.0, 12.2.1.4.0)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Fusion Middleware SSL Module (Apache HTTP Server) 12.2.1.3.0, 12.2.1.4.0 12.2.1.3.0 · 12.2.1.4.0

Products and versions

12 products, 37 version entries
SourceVendorProductSchemeAffected versions
nvd apache http server generic ≥ 2.4.7 and ＜ 2.4.52
nvd apple mac os x generic 10.15.7 · 10.15.7:security_update_2020-001 · 10.15.7:security_update_2021-001 · 10.15.7:security_update_2021-002 · 10.15.7:security_update_2021-003 · 10.15.7:security_update_2021-004 · 10.15.7:security_update_2021-005 · 10.15.7:security_update_2021-006 · 10.15.7:security_update_2021-007 · 10.15.7:security_update_2021-008 · 10.15.7:security_update_2022-001 · 10.15.7:security_update_2022-002 · 10.15.7:security_update_2022-003
nvd apple macos generic ＜ 10.15.7 · ≥ 11.0 and ＜ 11.6.6 · ≥ 12.0.0 and ＜ 12.4
nvd debian debian linux generic 10.0 · 11.0
nvd fedoraproject fedora generic 34 · 35 · 36
nvd oracle communications element manager generic ＜ 9.0
nvd oracle communications operations monitor generic 4.0 · 4.3 · 4.4 · 5.0
nvd oracle communications session report manager generic ＜ 9.0
nvd oracle communications session route manager generic ＜ 9.0
nvd oracle http server generic any version · 12.2.1.3.0 · 12.2.1.4.0
nvd oracle instantis enterprisetrack generic 17.1 · 17.2 · 17.3
nvd tenable tenable.sc generic ≥ 5.14.0 and ＜ 5.20.0 · ≥ 5.16.0 and ＜ 99999.1

References

URLTags
http://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory
http://seclists.org/fulldisclosure/2022/May/33 Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2022/May/35 Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2022/May/38 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/12/20/3 Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFSWOH4X77CV7AH7C4RMHUBDWKQDL4YH/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RGWILBORT67SHMSLYSQZG2NMXGCMPUZO/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X73C35MMMZGBVPQQCH7LQZUMYZNQA5FO/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7H26WJ6TPKNWV3QKY4BHKUKQVUTZJTD/
https://security.gentoo.org/glsa/202208-20 Third Party Advisory

Timeline
Published2021-12-20By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.