CVE-2018-12395

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CVSS 3.0

7.5 high

EPSS

3%p86

Published

Feb 28, 2019 (Feb 28, 2019)

Modified

Jun 17, 2026

Description

By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.

Vendors: mozilla debian canonical redhat
Products: firefox, firefox esr, debian linux, ubuntu linux, enterprise linux desktop, enterprise linux server, enterprise linux server eus, enterprise linux workstation
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (2.9%)

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