CVE-2019-9511
7.5 · HIGHOverview
CVE-2019-9511 is a high-severity vulnerability affecting apple swiftnio. It was published on August 13, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from apple. Update swiftnio to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| apple | swiftnio | 1.0.0 | Affected |
| apple | mac_os_x | 10.12 | Affected |
| canonical | ubuntu_linux | 14.04 | Affected |
| apache | traffic_server | 6.0.0 | Affected |
| mcafee | web_gateway | >= 7.7.2.0, < 7.7.2.24 | Affected |
| f5 | nginx | >= 1.9.5, < 1.16.1 | Affected |
References
Frequently Asked Questions
What is CVE-2019-9511?
CVE-2019-9511 is a high-severity vulnerability affecting apple swiftnio. It was published on August 13, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2019-9511?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2019-9511?
Check the references section for vendor advisories and patches from apple. Update swiftnio to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2019-9511?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-9511 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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