In firefox before 68.0, 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.
In firefox before 68.0, 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.
https://www.mozilla.org/en-US/security/advisories/mfsa2019-21/#CVE-2019-11728 https://bugzilla.mozilla.org/show_bug.cgi?id=1552993
Vulmon