A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3351-1 apache2 security update
EUVD EUVD EUVD-2021-19907 A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
Ubuntu USN Ubuntu USN USN-5090-1 Apache HTTP Server vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 15 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.01033}

epss

{'score': 0.01003}


Thu, 01 May 2025 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Debian
Debian debian Linux
CPEs cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Vendors & Products Debian
Debian debian Linux

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2024-08-03T23:42:20.253Z

Reserved: 2021-05-19T00:00:00

Link: CVE-2021-33193

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-08-16T08:15:11.480

Modified: 2025-05-01T15:40:12.163

Link: CVE-2021-33193

cve-icon Redhat

Severity : Moderate

Publid Date: 2021-08-05T00:00:00Z

Links: CVE-2021-33193 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses