CVE-2019-9516
6.5 · MEDIUMOverview
CVE-2019-9516 is a medium-severity vulnerability affecting apple swiftnio. It was published on August 13, 2019 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.
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-2019-9516?
CVE-2019-9516 is a medium-severity vulnerability affecting apple swiftnio. It was published on August 13, 2019 and has a CVSS 3.1 base score of 6.5 (MEDIUM).
How severe is CVE-2019-9516?
This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2019-9516?
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-2019-9516?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-9516 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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