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CVE-2021-30641
Unexpected URL matching with 'MergeSlashes OFF'
Medium5.3EPSS 51.8%
- Published
- Updated
- Reserved
- Assigned by
- apache
Description
Apache HTTP Server versions 2.4.39 to 2.4.46 Unexpected matching behavior with 'MergeSlashes OFF'
Timeline
ID reserved
By apache
- 58 days later
· 58 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 51.8% · top 1.0% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
- Unexpected URL matching with 'MergeSlashes OFF'
Affected products
Apache Software Foundation · Apache HTTP Server
- affected 2.4.46
- affected 2.4.43
- affected 2.4.41
- affected 2.4.39
References (12)
- http://httpd.apache.org/security/vulnerabilities_24.html (opens in a new tab)x_refsource_MISCx_transferred
- https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E (opens in a new tab)x_refsource_MISCx_transferred
- [httpd-announce] 20210609 CVE-2021-30641: Unexpected URL matching with 'MergeSlashes OFF' (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [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 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [oss-security] 20210609 CVE-2021-30641: Apache httpd: Unexpected URL matching with 'MergeSlashes OFF' (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- DSA-4937 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- GLSA-202107-38 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- FEDORA-2021-dce7e7738e (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2021-e3f6dd670d (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- https://www.oracle.com/security-alerts/cpuoct2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20210702-0001/ (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-30641)Record last updated .