Description
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.
Published: 2021-08-16
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

No remediation available yet.

Tracking

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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
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

Subscriptions

Apache Http Server
Debian Debian Linux
Fedoraproject Fedora
Oracle Secure Backup Zfs Storage Appliance Kit
Redhat Enterprise Linux Jboss Core Services Rhel Software Collections
Tenable Tenable.sc
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

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

Reserved: 2021-05-19T00:00:00.000Z

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