VULNERABILITY INTELLIGENCE
CVE-2019-9515
CVSS score7.5 HIGH
EPSS probability87.29%
CISA KEVNot currently listed
Published2019-08-13
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. The attacker sends a stream of SETTINGS frames to the peer. Since the RFC requires that the peer reply with one acknowledgement per SETTINGS frame, an empty SETTINGS frame is almost equivalent in behavior to a ping. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.
Weakness classification
- CWE-400: Uncontrolled Resource Consumption
- CWE-770: Allocation of Resources Without Limits or Throttling
Primary references
- cret@cert.org — Mailing List, Third Party Advisory
- cret@cert.org — Mailing List, Third Party Advisory
- cret@cert.org — Mailing List, Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory
- cret@cert.org — Third Party Advisory