medium
5.9
CWE
20
Advisory Published
CVE Published
CVE Published
Updated

CVE-2021-30641: Unexpected URL matching with 'MergeSlashes OFF'

First published: Tue Jun 01 2021(Updated: )

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.

Credit: security@apache.org

Affected SoftwareAffected VersionHow to fix
redhat/jbcs-httpd24-apr<0:1.6.3-107.el8
0:1.6.3-107.el8
redhat/jbcs-httpd24-apr-util<0:1.6.1-84.el8
0:1.6.1-84.el8
redhat/jbcs-httpd24-curl<0:7.78.0-2.el8
0:7.78.0-2.el8
redhat/jbcs-httpd24-httpd<0:2.4.37-78.el8
0:2.4.37-78.el8
redhat/jbcs-httpd24-nghttp2<0:1.39.2-39.el8
0:1.39.2-39.el8
redhat/jbcs-httpd24-openssl<1:1.1.1g-8.el8
1:1.1.1g-8.el8
redhat/jbcs-httpd24-openssl-chil<0:1.0.0-7.el8
0:1.0.0-7.el8
redhat/jbcs-httpd24-openssl-pkcs11<0:0.4.10-22.el8
0:0.4.10-22.el8
redhat/jbcs-httpd24-apr<0:1.6.3-107.jbcs.el7
0:1.6.3-107.jbcs.el7
redhat/jbcs-httpd24-apr-util<0:1.6.1-84.jbcs.el7
0:1.6.1-84.jbcs.el7
redhat/jbcs-httpd24-curl<0:7.78.0-2.jbcs.el7
0:7.78.0-2.jbcs.el7
redhat/jbcs-httpd24-httpd<0:2.4.37-78.jbcs.el7
0:2.4.37-78.jbcs.el7
redhat/jbcs-httpd24-nghttp2<0:1.39.2-39.jbcs.el7
0:1.39.2-39.jbcs.el7
redhat/jbcs-httpd24-openssl<1:1.1.1g-8.jbcs.el7
1:1.1.1g-8.jbcs.el7
redhat/jbcs-httpd24-openssl-chil<0:1.0.0-7.jbcs.el7
0:1.0.0-7.jbcs.el7
redhat/jbcs-httpd24-openssl-pkcs11<0:0.4.10-22.jbcs.el7
0:0.4.10-22.jbcs.el7
redhat/httpd<2.4.47
2.4.47
Apache Http Server>=2.4.39<=2.4.46
Debian=9.0
Debian=10.0
Fedora=34
Fedora=35
Oracle Enterprise Manager Ops Center=12.4.0.0
oracle instantis enterprisetrack=17.1
oracle instantis enterprisetrack=17.2
oracle instantis enterprisetrack=17.3
Oracle Sun ZFS Storage Appliance Kit=8.8

Remedy

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

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-30641?

    CVE-2021-30641 is a vulnerability found in Apache HTTP Server versions 2.4.39 to 2.4.46 that causes unexpected matching behavior with MergeSlashes OFF.

  • What is the severity of CVE-2021-30641?

    The severity of CVE-2021-30641 is medium with a severity value of 5.9.

  • How does CVE-2021-30641 affect data integrity?

    CVE-2021-30641 poses a threat to data integrity.

  • Which software versions are affected by CVE-2021-30641?

    Apache HTTP Server versions 2.4.39 to 2.4.46 are affected by CVE-2021-30641.

  • How can I fix CVE-2021-30641?

    To fix CVE-2021-30641, update Apache HTTP Server to version 2.4.47.

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