Summary
HTTP/2 DoS Attacks: Ping, Reset, and Settings Floods
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
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.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Already deployed Kodem?
See it in your environmentNew to Kodem? Get a demo →Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is GHSA-32GV-6CF3-WCMQ? GHSA-32GV-6CF3-WCMQ is a critical-severity security vulnerability in twisted (pip), affecting versions < 19.10.0. It is fixed in 19.10.0.
- Which versions of twisted are affected by GHSA-32GV-6CF3-WCMQ? twisted (pip) versions < 19.10.0 is affected.
- Is there a fix for GHSA-32GV-6CF3-WCMQ? Yes. GHSA-32GV-6CF3-WCMQ is fixed in 19.10.0. Upgrade to this version or later.
- Is GHSA-32GV-6CF3-WCMQ exploitable, and should I be worried? Whether GHSA-32GV-6CF3-WCMQ is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-32GV-6CF3-WCMQ is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-32GV-6CF3-WCMQ? Upgrade
twistedto 19.10.0 or later.