Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

References[email protected]/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/[email protected]/message/JUBYAF6ED3O4XCHQ5C2HYENJLXYXZC4M/[email protected]/message/LZLUYPYY3RX4ZJDWZRJIKSULYRJ4PXW7/[email protected]/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/[email protected]/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/[email protected]/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/


Source: MITRE

Published: 2019-08-13

Updated: 2021-01-20

Type: CWE-770

Risk Information

CVSS v2.0

Base Score: 7.8

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 10

Severity: HIGH

CVSS v3.0

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH