Swiftnio
CVE-2019-9511
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
1DescriptionNVD
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.
AnalysisAI
Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Uncontrolled Resource Consumption vulnerability could allow attackers to cause denial of service by exhausting system resources.
Technical ContextAI
This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. 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. Affected products include: Apple Swiftnio, Apache Traffic Server, Canonical Ubuntu Linux, Debian Debian Linux, Synology Skynas.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.
NIOHTTP1 and projects using it for generating HTTP responses can be subject to a HTTP Response Injection attack. Rated h
Some HTTP/2 implementations are vulnerable to a flood of empty frames, potentially leading to a denial of service. Rated
Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of s
Some HTTP/2 implementations are vulnerable to a settings flood, potentially leading to a denial of service. Rated high s
Some HTTP/2 implementations are vulnerable to a reset flood, potentially leading to a denial of service. Rated high seve
Some HTTP/2 implementations are vulnerable to resource loops, potentially leading to a denial of service. Rated high sev
Some HTTP/2 implementations are vulnerable to ping floods, potentially leading to a denial of service. Rated high severi
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. Rated medium se
Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today