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CVE-2021-30641

httpd: Unexpected URL matching with 'MergeSlashes OFF'

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Severity

Moderate

Red Hat Product Security

5.9

CVSS 3.1

Review impact separately from score.

Published · June 4, 2021

Updated · September 21, 2026

Description

A flaw was found in Apache httpd. A possible regression from an earlier security fix broke behavior of MergeSlashes. The highest threat from this vulnerability is to data integrity.

Statement

This flaw was introduced when fixing https://access.redhat.com/security/cve/cve-2019-0220, therefore versions of httpd package shipped with Red Hat Enterprise Linux 7, 8 and Red Hat Software Collections are affected by this flaw.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

This issue can be mitigated by setting the "MergeSlashes" directive to OFF

CVSS / CWE

CVSS 3.1 · 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CWE-20 · Improper Input Validation