Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. The attacker creates multiple request streams and continually shuffles the priority of the streams in a way that causes substantial churn to the priority tree. This can consume excess CPU.

References[email protected]/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/[email protected]/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/[email protected]/message/JUBYAF6ED3O4XCHQ5C2HYENJLXYXZC4M/[email protected]/message/LZLUYPYY3RX4ZJDWZRJIKSULYRJ4PXW7/[email protected]/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/[email protected]/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/


Source: MITRE

Published: 2019-08-13

Updated: 2021-01-20

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