CVE-2018-9517 is a vulnerability that affects Apache HTTP Server and was first reported on August 22, 2018. The vulnerability arises due to a flaw in the handling of certain HTTP/2 requests by the server. Attackers can exploit this vulnerability to cause a denial-of-service (DoS) attack, which can lead to the server crashing or becoming unresponsive.
The vulnerability occurs when an attacker sends a malicious request with a specially crafted HTTP/2 frame that exceeds the size limit allowed by the server. This can cause the server to consume excessive resources, leading to a DoS attack. Successful exploitation of this vulnerability can result in a critical impact on the availability of the Apache HTTP Server.
To mitigate the risk associated with this vulnerability, Apache has released security updates to address the issue. Users are advised to update their software to the latest version as soon as possible. Additionally, it is recommended to implement network-level protections such as rate limiting and traffic filtering to prevent potential attackers from exploiting this vulnerability. Overall, it is important for organizations to stay vigilant and promptly apply security updates to their systems to protect against known vulnerabilities like CVE-2018-9517.