QID 150404

Date Published: 2021-12-06

QID 150404: Apache HTTP Server NULL pointer dereference (CVE-2021-41524)

The Apache HTTP Server, colloquially called Apache, is a free and open-source cross-platform web server software.

On affected version of Apache HTTP Server a NULL pointer dereference vulnerability exists in HTTP/2 requests, which allows a remote attacker to perform denial of service (DoS) attack on the target server.

Affected Versions:
Apache HTTP Server 2.4.49

QID Detection Logic (Unauthenticated):
This QID sends a HTTP GET request and checks the response headers to confirm if the host is running vulnerable version of Apache HTTP Server.

Successful exploitation of this vulnerability would allow a remote attacker to perform a denial of service (DoS) attack by sending specially crafted requests and crash the target server.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Customers are advised to upgrade to the latest version of Apache HTTP Server to remediate this vulnerability. For more information related to this vulnerability please refer to Apache's Security advisory

Vendor References

Apache HTTP Server Security Advisory - httpd.apache.org/security/vulnerabilities_24.html

CVEs related to QID 150404

CVE-2021-41524 |

Software Advisories

Advisory ID	Software	Component	Link
Apache HTTP Server			httpd.apache.org/download.cgi

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