Vulnerability identifier: #VU18108
Vulnerability risk: Medium
Exploitation vector: Network
Exploit availability: No
Apache HTTP Server
Server applications / Web servers
Vendor: Apache Foundation
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an error within the mod_http2 module when processing update requests from http/1.1 to http/2, if this was not the first request on a connection. A remote attacker can send specially crafted requests to the affected server and perform denial of service attack.
Successful exploitation of the vulnerability requires that HTTP/2 protocol is enabled for a "http:" host or H2Upgrade is enabled for h2 on a "https:" host.
Install updates from vendor's website.
Vulnerable software versions
Apache HTTP Server: 2.4.34 - 2.4.38
Can this vulnerability be exploited remotely?
Is there known malware, which exploits this vulnerability?