CVE-2019-9517
HIGH7.5EPSS 4.6%Published: 8/13/2019Modified: 4/28/2026
Description
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.
Affected packages (3)
- Alpine/apache2from 0, < 2.4.41-r0
- Alpine/nodejsfrom 0, < 10.16.3-r0
- Debian/apache2from 0, < 2.4.41-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |