CVE-2019-9517

  • Published Date: Tue 13 Aug 2019
  • Last Modified Date: Wed 21 Aug 2019

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

Impact

Severity: HIGH
Exploitability Score: 10.0
Impact Score: 6.9
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
Availability (A): COMPLETE

References (Advisories, Solutions, and Tools):



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