Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.

References[email protected]/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/[email protected]/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/[email protected]/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/[email protected]/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/[email protected]/message/POPAEC4FWL4UU4LDEGPY5NPALU24FFQD/[email protected]/message/TAZZEVTCN2B4WT6AIBJ7XGYJMBTORJU5/[email protected]/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/


Source: MITRE

Published: 2019-08-13

Updated: 2021-01-16

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