Vulnerability · Published Jun 10, 2021 · Assigned by apache
CVE-2021-30641Unexpected URL matching with 'MergeSlashes OFF'
Medium 5.3
In plain English
A medium-severity security flaw in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 51.8% (higher than 99% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.3Medium
Exploit odds (30 days)51.8%top 1.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | mod_http2 | 1.15.7-3.module_el8.5.0+2609+b30d9eec | ALSA-2021:4257 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.5.0+2609+b30d9eec | ALSA-2021:4257 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2021:4257 |
| Alpine:v3.20 | apache2 | 2.4.48-r0 | ALPINE-CVE-2021-30641 |
| Alpine:v3.21 | apache2 | 2.4.48-r0 | ALPINE-CVE-2021-30641 |
| Alpine:v3.22 | apache2 | 2.4.48-r0 | ALPINE-CVE-2021-30641 |
| Alpine:v3.23 | apache2 | 2.4.48-r0 | ALPINE-CVE-2021-30641 |
| Alpine:v3.24 | apache2 | 2.4.48-r0 | ALPINE-CVE-2021-30641 |
| Debian:12 | apache2 | 2.4.46-6 | DEBIAN-CVE-2021-30641 |
| Debian:13 | apache2 | 2.4.46-6 | DEBIAN-CVE-2021-30641 |
| Debian:14 | apache2 | 2.4.46-6 | DEBIAN-CVE-2021-30641 |
| Rocky Linux:8 | httpd | 0:2.4.37-41.module+el8.5.0+695+1fa8055e | RLSA-2021:4257 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-3.module+el8.5.0+695+1fa8055e | RLSA-2021:4257 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-3.module+el8.4.0+553+7a69454b | RLSA-2021:4257 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2021:4257 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.5.0+695+1fa8055e | RLSA-2021:4257 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.462.4.432.4.412.4.39 |
References
- http://httpd.apache.org/security/vulnerabilities_24.html x_refsource_MISC
- https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E x_refsource_MISC
- [httpd-announce] 20210609 CVE-2021-30641: Unexpected URL matching with 'MergeSlashes OFF' mailing-list, x_refsource_MLIST
- [httpd-dev] 20210610 Re: svn commit: r1890598 - in /httpd/site/trunk/content/security/json: CVE-2019-17567.json CVE-2020-13938.json CVE-2020-13950.json CVE-2020-35452.json CVE-2021-26690.json CVE-2021-26691.json CVE-2021-30641.json CVE-2021-31618.json mailing-list, x_refsource_MLIST
- [oss-security] 20210609 CVE-2021-30641: Apache httpd: Unexpected URL matching with 'MergeSlashes OFF' mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update mailing-list, x_refsource_MLIST
- DSA-4937 vendor-advisory, x_refsource_DEBIAN
- GLSA-202107-38 vendor-advisory, x_refsource_GENTOO
- FEDORA-2021-dce7e7738e vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-e3f6dd670d vendor-advisory, x_refsource_FEDORA
- https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210702-0001/ x_refsource_CONFIRM