CVE-2021-42013 (GCVE-0-2021-42013)

Vulnerability from cvelistv5 – Published: 2021-10-07 15:50 – Updated: 2025-10-21 23:25
VLAI CISA KEV
Title
Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)
Summary
It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.
Severity
No CVSS data available.
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
URL Tags
https://httpd.apache.org/security/vulnerabilities… x_refsource_MISC
https://lists.apache.org/thread.html/r7c795cd45a3… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb5b0e46f179… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/07/6 mailing-listx_refsource_MLIST
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
http://jvn.jp/en/jp/JVN51106450/index.html third-party-advisoryx_refsource_JVN
http://www.openwall.com/lists/oss-security/2021/10/08/1 mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r17a4c6ce9af… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/2 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/3 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/4 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/6 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/5 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/09/1 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/11/4 mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2021/10/15/3 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/16/1 mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021102… x_refsource_CONFIRM
http://packetstormsecurity.com/files/164629/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/164941/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/164501/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/164609/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/165089/Apach… x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
http://packetstormsecurity.com/files/167397/Apach… x_refsource_MISC
https://www.povilaika.com/apache-2-4-50-exploit/ x_refsource_MISC
https://security.gentoo.org/glsa/202208-20 vendor-advisoryx_refsource_GENTOO
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: Apache HTTP Server 2.4.49
Affected: Apache HTTP Server 2.4.50
Create a notification for this product.
Credits
Reported by Juan Escobar from Dreamlab Technologies, Fernando Muñoz from NULL Life CTF Team, and Shungo Kumasaka
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 56199eb0-066c-479a-9862-e8ef3a80ac69

Vulnerability ID: CVE-2021-42013

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Apache HTTP Server Path Traversal Vulnerability | Affected: Apache / HTTP Server | Description: Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default require all denied or if CGI scripts are enabled. This CVE ID resolves an incomplete patch for CVE-2021-41773. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-42013
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-22
Feed CISA Known Exploited Vulnerabilities Catalog
Product HTTP Server
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject Apache
Vulnerabilityname Apache HTTP Server Path Traversal Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 13:26 UTC | Updated: 2026-02-06 07:53 UTC
Show details on NVD website
To clipboard 

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\"http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html\", \"name\": \"http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\", \"name\": \"https://www.oracle.com/security-alerts/cpuapr2022.html\", \"refsource\": \"MISC\"}, {\"url\": \"http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html\", \"name\": \"http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://www.povilaika.com/apache-2-4-50-exploit/\", \"name\": \"https://www.povilaika.com/apache-2-4-50-exploit/\", \"refsource\": \"MISC\"}, {\"url\": \"https://security.gentoo.org/glsa/202208-20\", \"name\": \"GLSA-202208-20\", \"refsource\": \"GENTOO\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration \\\"require all denied\\\", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2021-42013\", \"STATE\": \"PUBLIC\", \"TITLE\": \"Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)\", \"ASSIGNER\": \"security@apache.org\"}}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-42013\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:25:30.222Z\", \"dateReserved\": \"2021-10-06T00:00:00.000Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2021-10-07T15:50:14.000Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.