CVE-2021-30641
httpd: Unexpected URL matching with 'MergeSlashes OFF'
Severity
ModerateRed Hat Product Security
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 · 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-20 · Improper Input Validation