7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.01 Low
EPSS
Percentile
83.1%
Severity: High
Date : 2021-06-09
CVE-ID : CVE-2021-31618
Package : apache
Type : denial of service
Remote : Yes
Link : https://security.archlinux.org/AVG-2041
The package apache before version 2.4.48-1 is vulnerable to denial of
service.
Upgrade to 2.4.48-1.
The problem has been fixed upstream in version 2.4.48.
None.
A security issue has been found in the Apache HTTP Server (httpd)
before version 2.4.48. The Apache HTTP Server protocol handler for the
HTTP/2 protocol checks received request headers against the size
limitations as configured for the server and used for the HTTP/1
protocol as well. On violation of these restrictions, an HTTP response
is sent to the client with a status code indicating why the request was
rejected.
This rejection response was not fully initialised in the HTTP/2
protocol handler if the offending header was the very first one
received or appeared in a footer. This led to a NULL pointer
dereference on initialised memory, reliably crashing the child process.
Since such a triggering HTTP/2 request is easy to craft and submit,
this can be exploited for denial of service (DoS) of the server.
A remote attacker could crash the HTTP server using a crafted HTTP/2
request.
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2021-31618
https://svn.apache.org/viewvc?view=revision&revision=1889759
https://security.archlinux.org/CVE-2021-31618
7.5 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
0.01 Low
EPSS
Percentile
83.1%