HTTP/2 DoS Attacks: Ping, Reset, and Settings Floods
Impact
Twisted web servers that utilize the optional HTTP/2 support suffer from the following flow-control related vulnerabilities:
Ping flood: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9512 Reset flood: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9514 Settings flood: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9515
A Twisted web server supports HTTP/2 requests if you've installed the http2 optional dependency set.
Workarounds
There are no workarounds.
References
https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
For more information
If you have any questions or comments about this advisory:
- Open an issue in Twisted's Trac
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | twisted | < 19.10.0 | 19.10.0 |
References
- Weakness (CWE)
-- Platform
- Python (PyPI)
- Package
twisted- Disclosed
- 14.03.2022
- Updated
- 11.10.2026 12:19
Sources and licenses
OSV / GitHub Advisory Database - GHSA-32gv-6cf3-wcmq - CC BY 4.0
Vulnerability history: twisted
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 06.2019 10.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 5
- High 4
- Medium 8
Disclosures per year
- 2019: 3
- 2020: 3
- 2021: 0
- 2022: 6
- 2023: 1
- 2024: 2
- 2025: 0
- 2026: 2
-
HTTP/2 DoS Attacks: Ping, Reset, and Settings Floods this entry
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