// For flags

CVE-2021-41524

null pointer dereference in h2 fuzzing

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.

Mientras se realizaba el fuzzing del httpd versión 2.4.49, se detectó una nueva desreferencia de puntero null durante el procesamiento de peticiones HTTP/2, permitiendo a una fuente externa hacer DoS al servidor. Esto requiere una petición especialmente diseñada. La vulnerabilidad fue introducida recientemente en la versión 2.4.49. No se conoce ninguna explotación en el proyecto

Red Hat JBoss Core Services is a set of supplementary software for Red Hat JBoss middleware products. This software, such as Apache HTTP Server, is common to multiple JBoss middleware products, and is packaged under Red Hat JBoss Core Services to allow for faster distribution of updates, and for a more consistent update experience. This release of Red Hat JBoss Core Services Apache HTTP Server 2.4.51 serves as a replacement for Red Hat JBoss Core Services Apache HTTP Server 2.4.37 Service Pack 10, and includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the References. Issues addressed include code execution, integer overflow, null pointer, out of bounds read, out of bounds write, and server-side request forgery vulnerabilities.

*Credits: Apache httpd team would like to thank LI ZHI XIN from NSFocus Security Team for reporting this issue.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-09-20 CVE Reserved
  • 2021-10-05 CVE Published
  • 2024-08-04 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-476: NULL Pointer Dereference
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Apache
Search vendor "Apache"
 Http Server
Search vendor "Apache" for product "Http Server"
 2.4.49
Search vendor "Apache" for product "Http Server" and version "2.4.49"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 34
Search vendor "Fedoraproject" for product "Fedora" and version "34"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 35
Search vendor "Fedoraproject" for product "Fedora" and version "35"
-
Affected
Oracle
Search vendor "Oracle"
 Instantis Enterprisetrack
Search vendor "Oracle" for product "Instantis Enterprisetrack"
 17.1
Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.1"
-
Affected
Oracle
Search vendor "Oracle"
 Instantis Enterprisetrack
Search vendor "Oracle" for product "Instantis Enterprisetrack"
 17.2
Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.2"
-
Affected
Oracle
Search vendor "Oracle"
 Instantis Enterprisetrack
Search vendor "Oracle" for product "Instantis Enterprisetrack"
 17.3
Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.3"
-
Affected
Netapp
Search vendor "Netapp"
 Cloud Backup
Search vendor "Netapp" for product "Cloud Backup"
--
Affected