HTTP/2 DoS Attacks: Ping, Reset, and Settings Floods
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### 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](https://twistedmatrix.com/documents/19.2.0/installation/howto/optional.html). ### 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](https://twistedmatrix.com/trac/)
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | twisted (PyPI) | before 19.10.0 | 19.10.0 | Patch available | GHSA-32gv-6cf3-wcmq |
- twisted (PyPI) Vendor— Affected before 19.10.0 Fixed in 19.10.0 Patch available GHSA-32gv-6cf3-wcmq
Remediation
- Fix · GHSA-32gv-6cf3-wcmq twisted (PyPI) Fixed in 19.10.0 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-32gv-6cf3-wcmq
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences