CVE-2023-43622
Scores
EPSS
Percentile: 61.3%
CVSS
CVSS Score: 7.5/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
None (N)
Measures the impact to the confidentiality of information
Integrity Impact
None (N)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
High (H)
Measures the impact to the availability of the impacted component
Description
An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the server, similar to the well known “slow loris” attack pattern.
This has been fixed in version 2.4.58, so that such connection are terminated properly after the configured connection timeout.
This issue affects Apache HTTP Server: from 2.4.55 through 2.4.57.
Users are recommended to upgrade to version 2.4.58, which fixes the issue.
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Sources
CWEs
Related Vulnerabilities
Exploits
Vulnerable Software (13)
Type: Configuration
Product: apache2
Operating System: astra 1.7.5.16
{ "unaffected": true}
Source: astra
Type: Configuration
Product: apache2
Operating System: astra 4.7.6.9
{ "unaffected": true}
Source: astra
Type: Configuration
Product: apache2
Operating System: ubuntu bionic 18.04
{ "unfixed": true}
Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu focal 20.04
{ "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 lunar 23.04
{ "fixed": "2.4.55-1ubuntu2.1"}
Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu mantic 23.10
{ "fixed": "2.4.57-2ubuntu2.1"}
Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu trusty 14.04
{ "unfixed": true}
Source: ubuntu
Type: Configuration
Product: apache2
Operating System: ubuntu xenial 16.04
{ "unfixed": true}
Source: ubuntu
Type: Configuration
Product: apache2
Operating System: debian
{ "fixed": "2.4.58-1"}
Source: debian
Type: Configuration
Product: apache2
Operating System: debian buster 10
{ "unaffected": true}
Source: debian
Type: Configuration
Product: mod_http2
Operating System: rhel
{ "fixed": "2.0.26-1.el9"}
Source: redhat
Type: Configuration
Vendor: *
Product: http_server
Operating System: * * *
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.4.58", "versionStartIncluding": "2.4.55", "vulnerable": true ...
{ "cpe_match": [ { "cpe23uri": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.4.58", "versionStartIncluding": "2.4.55", "vulnerable": true } ], "operator": "OR"}
Source: nvd