CVE-2019-9517 : Vulnerability Insights and Analysis
Learn about CVE-2019-9517, a vulnerability in certain HTTP/2 implementations causing unrestricted internal data buffering, potentially leading to a denial of service. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
Certain HTTP/2 implementations have a vulnerability where unrestricted internal data buffering can occur, potentially leading to a denial of service.
Understanding CVE-2019-9517
Some HTTP/2 implementations are vulnerable to unconstrained internal data buffering, potentially causing a denial of service.
What is CVE-2019-9517?
- Vulnerability in certain HTTP/2 implementations causing unrestricted internal data buffering
- Attacker can exploit by opening the HTTP/2 window while keeping the TCP window closed
- Results in excessive memory or CPU usage due to queuing responses
The Impact of CVE-2019-9517
- CVSS Base Score: 7.5 (High)
- Attack Vector: Network
- Attack Complexity: Low
- Availability Impact: High
- CWE-400: Uncontrolled Resource Consumption
Technical Details of CVE-2019-9517
Vulnerability Description
- Vulnerability in HTTP/2 implementations leading to denial of service
Affected Systems and Versions
- Product: n/a
- Vendor: n/a
- Version: n/a
Exploitation Mechanism
- Attacker opens HTTP/2 window, allowing data transmission without constraints
- TCP window remains closed, preventing actual data transmission
- Sends requests for large response objects, causing resource exhaustion
Mitigation and Prevention
Immediate Steps to Take
- Apply patches and updates from relevant vendors
- Monitor network traffic for suspicious activities
Long-Term Security Practices
- Regularly update software and systems
- Implement network segmentation and access controls
- Conduct regular security assessments
Patching and Updates
- Check vendor advisories for patches and updates