CVE-2019-11728

Mozilla: Port scanning through Alt-Svc header

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Severity

Low

Red Hat Product Security

4.7

CVSS 3.0

Review impact separately from score.

Published · July 9, 2019

Updated · November 22, 2025

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.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 4.7
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor