CVE-2021-41773

KEV
Published: Ott 05, 2021 Last Modified: Feb 17, 2026
ExploitDB:
Other exploit source:
Google Dorks:
CRITICAL 9,8
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
MEDIUM 4,3
Source: [email protected]
Access Vector: network
Access Complexity: medium
Authentication: none
Confidentiality: partial
Integrity: none
Availability: none

Description

AI Translation Available

A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. 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 is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. The fix in Apache HTTP Server 2.4.50 was found to be incomplete, see CVE-2021-42013.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,9438
Percentile
1,0th
Updated

EPSS Score Trend (Last 90 Days)

22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Stable
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Confidentiality Availability
Potential Impacts:
Execute Unauthorized Code Or Commands Modify Files Or Directories Read Files Or Directories Dos: Crash, Exit, Or Restart
Applicable Platforms
Technologies: AI/ML
Likelihood of Exploit: High
View CWE Details
Exploit

Apache HTTP Server 2.4.49 - Path Traversal & …

Verified

Apache HTTP Server 2.4.49 - Path Traversal & Remote Code Execution (RCE)

Author: Lucas Souza Published: Status: Verified
View Exploit Code →
Exploit

Apache HTTP Server 2.4.50 - Remote Code Execution …

Verified

Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (3)

Author: Valentin Lobstein Published: Status: Verified
View Exploit Code →
Application

Cloud Backup by Netapp

Product Information
Vendor Netapp
Product Cloud Backup
Version -
cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Instantis Enterprisetrack by Oracle

Product Information
Vendor Oracle
Product Instantis Enterprisetrack
Version 17.3
cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Fedora by Fedoraproject

Product Information
Vendor Fedoraproject
Product Fedora
Version 35
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Instantis Enterprisetrack by Oracle

Product Information
Vendor Oracle
Product Instantis Enterprisetrack
Version 17.1
cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Operating System

Fedora by Fedoraproject

Product Information
Vendor Fedoraproject
Product Fedora
Version 34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Http Server by Apache

Product Information
Vendor Apache
Product Http Server
Version 2.4.49
cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Instantis Enterprisetrack by Oracle

Product Information
Vendor Oracle
Product Instantis Enterprisetrack
Version 17.2
cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://www.cisa.gov/known-exploited-vulnerabilities-catalo…
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021…
http://packetstormsecurity.com/files/164418/Apache-HTTP-Ser…
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Trav…
http://packetstormsecurity.com/files/164418/Apache-HTTP-Ser…
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Trav…
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2…
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remo…
http://packetstormsecurity.com/files/164941/Apache-HTTP-Ser…
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Co…
https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/security/vulnerabilities_24.html
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd945…
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb233…
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f…
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78…
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e5…
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8…
https://lists.apache.org/thread.html/r98d704ed4377ed889d404…
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebd…
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c7020…
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://security.gentoo.org/glsa/202208-20
https://security.gentoo.org/glsa/202208-20
https://security.netapp.com/advisory/ntap-20211029-0009/
https://security.netapp.com/advisory/ntap-20211029-0009/
https://tools.cisco.com/security/center/content/CiscoSecuri…
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-…
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.oracle.com/security-alerts/cpujan2022.html
http://www.openwall.com/lists/oss-security/2021/10/05/2
http://www.openwall.com/lists/oss-security/2021/10/05/2
http://www.openwall.com/lists/oss-security/2021/10/07/1
http://www.openwall.com/lists/oss-security/2021/10/07/1
http://www.openwall.com/lists/oss-security/2021/10/07/6
http://www.openwall.com/lists/oss-security/2021/10/07/6
http://www.openwall.com/lists/oss-security/2021/10/08/1
http://www.openwall.com/lists/oss-security/2021/10/08/1
http://www.openwall.com/lists/oss-security/2021/10/08/2
http://www.openwall.com/lists/oss-security/2021/10/08/2
http://www.openwall.com/lists/oss-security/2021/10/08/3
http://www.openwall.com/lists/oss-security/2021/10/08/3
http://www.openwall.com/lists/oss-security/2021/10/08/4
http://www.openwall.com/lists/oss-security/2021/10/08/4
http://www.openwall.com/lists/oss-security/2021/10/08/5
http://www.openwall.com/lists/oss-security/2021/10/08/5
http://www.openwall.com/lists/oss-security/2021/10/08/6
http://www.openwall.com/lists/oss-security/2021/10/08/6
http://www.openwall.com/lists/oss-security/2021/10/09/1
http://www.openwall.com/lists/oss-security/2021/10/09/1
http://www.openwall.com/lists/oss-security/2021/10/11/4
http://www.openwall.com/lists/oss-security/2021/10/11/4
http://www.openwall.com/lists/oss-security/2021/10/15/3
http://www.openwall.com/lists/oss-security/2021/10/15/3
http://www.openwall.com/lists/oss-security/2021/10/16/1
http://www.openwall.com/lists/oss-security/2021/10/16/1
http://packetstormsecurity.com/files/164418/Apache-HTTP-Ser…
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Trav…
http://packetstormsecurity.com/files/164418/Apache-HTTP-Ser…
http://packetstormsecurity.com/files/164418/Apache-HTTP-Server-2.4.49-Path-Trav…
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2…
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remo…
http://packetstormsecurity.com/files/164941/Apache-HTTP-Ser…
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Co…
https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/security/vulnerabilities_24.html
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd945…
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb233…
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f…
https://lists.apache.org/thread.html/r6abf5f2ba6f1aa8b1030f95367aaf17660c4e4c78…
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e5…
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8…
https://lists.apache.org/thread.html/r98d704ed4377ed889d404…
https://lists.apache.org/thread.html/r98d704ed4377ed889d40479db79ed1ee2f43b2ebd…
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c7020…
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://lists.fedoraproject.org/archives/list/package-annou…
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapr…
https://security.gentoo.org/glsa/202208-20
https://security.gentoo.org/glsa/202208-20
https://security.netapp.com/advisory/ntap-20211029-0009/
https://security.netapp.com/advisory/ntap-20211029-0009/
https://tools.cisco.com/security/center/content/CiscoSecuri…
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-…
https://www.oracle.com/security-alerts/cpujan2022.html
https://www.oracle.com/security-alerts/cpujan2022.html
http://www.openwall.com/lists/oss-security/2021/10/05/2
http://www.openwall.com/lists/oss-security/2021/10/05/2
http://www.openwall.com/lists/oss-security/2021/10/07/1
http://www.openwall.com/lists/oss-security/2021/10/07/1
http://www.openwall.com/lists/oss-security/2021/10/07/6
http://www.openwall.com/lists/oss-security/2021/10/07/6
http://www.openwall.com/lists/oss-security/2021/10/08/1
http://www.openwall.com/lists/oss-security/2021/10/08/1
http://www.openwall.com/lists/oss-security/2021/10/08/2
http://www.openwall.com/lists/oss-security/2021/10/08/2
http://www.openwall.com/lists/oss-security/2021/10/08/3
http://www.openwall.com/lists/oss-security/2021/10/08/3
http://www.openwall.com/lists/oss-security/2021/10/08/4
http://www.openwall.com/lists/oss-security/2021/10/08/4
http://www.openwall.com/lists/oss-security/2021/10/08/5
http://www.openwall.com/lists/oss-security/2021/10/08/5
http://www.openwall.com/lists/oss-security/2021/10/08/6
http://www.openwall.com/lists/oss-security/2021/10/08/6
http://www.openwall.com/lists/oss-security/2021/10/09/1
http://www.openwall.com/lists/oss-security/2021/10/09/1
http://www.openwall.com/lists/oss-security/2021/10/11/4
http://www.openwall.com/lists/oss-security/2021/10/11/4
http://www.openwall.com/lists/oss-security/2021/10/15/3
http://www.openwall.com/lists/oss-security/2021/10/15/3
http://www.openwall.com/lists/oss-security/2021/10/16/1
http://www.openwall.com/lists/oss-security/2021/10/16/1