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CVE-2019-11728

4.7 · MEDIUM

The HTTP Alternative Services header, Alt-Svc, can be used by a malicious site to scan all TCP ports of any host that the accessible to a user when web content is loaded.

Published Jul 23, 2019CWE-668EPSS 1.12%

Overview

CVE-2019-11728 is a medium-severity vulnerability. It was published on July 23, 2019 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The HTTP Alternative Services header, Alt-Svc, can be used by a malicious site to scan all TCP ports of any host that the accessible to a user when web content is loaded. This vulnerability affects Firefox < 68.

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/2019-10/msg00009.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00010.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00011.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00017.htmlRefbugzilla.mozilla.org/show_bug.cgi?id=1552993Refsecurity.gentoo.org/glsa/201908-12Refwww.mozilla.org/security/advisories/mfsa2019-21/Reflists.opensuse.org/opensuse-security-announce/2019-10/msg00009.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00010.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html

How CyberStrike helps

Frequently asked questions

What is CVE-2019-11728?

CVE-2019-11728 is a medium-severity vulnerability. It was published on July 23, 2019 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2019-11728?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-11728?

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-2019-11728?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-11728 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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