CVE-2021-41773
Scores
EPSS
Percentile: 94.4%
CVSS
CVSS Score: 7.5/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
None (N)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
High (H)
Measures the impact to the confidentiality of information
Integrity Impact
None (N)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
None (N)
Measures the impact to the availability of the impacted component
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Medium
Describes the conditions beyond the attacker's control
Authentication
None (N)
Describes the level of privileges an attacker must possess
Confidentiality Impact
Partial
Measures the impact to the confidentiality of information
Integrity Impact
None (N)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
None (N)
Measures the impact to the availability of the impacted component
Description
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.
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Sources
CWEs
Related Vulnerabilities
Exploits
Exploit ID: CVE-2021-41773
Source: cisa
URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Recommendations
Source: nvd
All Apache HTTPD users should upgrade to the latest version:
# emerge –sync
# emerge –ask –oneshot –verbose “>=www-servers/apache-2.4.54”
All Apache HTTPD tools users should upgrade to the latest version:
# emerge –sync
# emerge –ask –oneshot –verbose “>=app-admin/apache-tools-2.4.54”
Vulnerable Software (15)
Type: Configuration
Product: apache2
Operating System: ubuntu bionic 18.04
{
"unaffected": true
}Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu focal 20.04
{
"unaffected": true
}Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu hirsute 21.04
{
"unaffected": true
}Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu impish 21.10
{
"unaffected": true
}Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu jammy 22.04
{
"unaffected": true
}Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu trusty 14.04
{
"unaffected": true
}Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu xenial 16.04
{
"unaffected": true
}Source: ubuntu
Type: Configuration
Product: apache2
Operating System: debian
{
"fixed": "2.4.50-1"
}Source: debian
Type: Configuration
Product: apache2
Operating System: debian bullseye 11
{
"unaffected": true
}Source: debian
Type: Configuration
Product: apache2
Operating System: debian buster 10
{
"unaffected": true
}Source: debian
Type: Configuration
Product: apache2
Operating System: debian stretch 9
{
"unaffected": true
}Source: debian
Type: Configuration
Vendor: apache
Product: http_server
Operating System: * * *
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
}Source: nvd
Type: Configuration
Vendor: fedoraproject
Product: fedora
Operating System: * * *
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",...{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
}Source: nvd
Type: Configuration
Vendor: netapp
Product: cloud_backup
Operating System: * * *
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
}Source: nvd
Type: Configuration
Vendor: oracle
Product: instantis_enterprisetrack
Operating System: * * *
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:oracle:instantis_enterpri...{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:a:oracle:instantis_enterprisetrack:17.1:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:oracle:instantis_enterprisetrack:17.2:*:*:*:*:*:*:*",
"vulnerable": true
},
{
"cpe23uri": "cpe:2.3:a:oracle:instantis_enterprisetrack:17.3:*:*:*:*:*:*:*",
"vulnerable": true
}
],
"operator": "OR"
}Source: nvd