CVE-2021-30641

Unexpected URL matching with 'MergeSlashes OFF'

Description

Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'

5.3

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 21.35% Top 5%

Vendor Advisory debian.org Vendor Advisory gentoo.org Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory apache.org Vendor Advisory apache.org

Affected: Apache Software Foundation Apache HTTP Server

Link	Tags
http://httpd.apache.org/security/vulnerabilities_24.html	vendor advisory
https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E	mailing list release notes vendor advisory
https://lists.apache.org/thread.html/r2b4773944d83d2799de9fbaeee7fe0f3fd72669467787e02f434cb10%40%3Cannounce.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111bb5d15cda0a68dd%40%3Cdev.httpd.apache.org%3E	mailing list
http://www.openwall.com/lists/oss-security/2021/06/10/8	third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html	third party advisory mailing list
https://www.debian.org/security/2021/dsa-4937	third party advisory vendor advisory
https://security.gentoo.org/glsa/202107-38	third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD/	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R/	vendor advisory
https://www.oracle.com/security-alerts/cpuoct2021.html	third party advisory
https://security.netapp.com/advisory/ntap-20210702-0001/	third party advisory

What is the severity of CVE-2021-30641?: CVE-2021-30641 has been scored as a medium severity vulnerability.
How to fix CVE-2021-30641?: To fix CVE-2021-30641, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-30641 being actively exploited in the wild?: It is possible that CVE-2021-30641 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~21% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-30641?: CVE-2021-30641 affects Apache Software Foundation Apache HTTP Server.