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CVE-2019-9517

7.5 · HIGH

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service.

Published Aug 13, 2019CWE-400EPSS 27.89%

Overview

CVE-2019-9517 is a high-severity vulnerability. 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 unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

References

Reflists.opensuse.org/opensuse-security-announce/2019-09/msg00004.htmlReflists.opensuse.org/opensuse-security-announce/2019-09/msg00031.htmlReflists.opensuse.org/opensuse-security-announce/2019-09/msg00032.htmlRefwww.openwall.com/lists/oss-security/2019/08/15/7Refaccess.redhat.com/errata/RHSA-2019:2893Refaccess.redhat.com/errata/RHSA-2019:2925Refaccess.redhat.com/errata/RHSA-2019:2939Refaccess.redhat.com/errata/RHSA-2019:2946Refaccess.redhat.com/errata/RHSA-2019:2949Refaccess.redhat.com/errata/RHSA-2019:2950

How CyberStrike helps

Frequently asked questions

What is CVE-2019-9517?

CVE-2019-9517 is a high-severity vulnerability. It was published on August 13, 2019 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2019-9517?

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-2019-9517?

Check the references section for vendor advisories, patches, and mitigation guidance. 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-2019-9517?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-9517 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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