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Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler

🗓️ 08 Dec 2021 10:36:35Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 5 Views

XMLHttpRequest error codes could reveal external protocol handlers and identify applications.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
ALT Linux		Security fix for the ALT Linux 10 package firefox-esr version 91.4.0-alt1
14 Dec 202100:00
–altlinux
ALT Linux		Security fix for the ALT Linux 10 package thunderbird version 91.4.0-alt1
21 Dec 202100:00
–altlinux
IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities in Mozilla Firefox affect IBM Cloud Pak for Multicloud Management Monitoring.
31 Jan 202314:47
–ibm
IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities of Mozilla Firefox (less than Firefox 91.8.0ESR) have affected Synthetic Playback Agent 8.1.4.0-8.1.4 IF16 - 2022.4.0
29 Apr 202204:43
–ibm
ATTACKERKB		CVE-2021-43542
8 Dec 202122:15
–attackerkb
Tenable Nessus		AlmaLinux 8 : firefox (ALSA-2021:5013)
9 Feb 202200:00
–nessus
Tenable Nessus		AlmaLinux 8 : thunderbird (ALSA-2021:5045)
9 Feb 202200:00
–nessus
Tenable Nessus		CentOS 8 : firefox (CESA-2021:5013)
10 Dec 202100:00
–nessus
Tenable Nessus		CentOS 8 : thunderbird (CESA-2021:5045)
10 Dec 202100:00
–nessus
Tenable Nessus		CentOS 7 : firefox (RHSA-2021:5014)
9 Oct 202400:00
–nessus
Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux7.9i686firefox91.4.0-1.el7_9firefox-91.4.0-1.el7_9.i686.rpm
Red Hat Enterprise Linux7.9ppc64firefox91.4.0-1.el7_9firefox-91.4.0-1.el7_9.ppc64.rpm
Red Hat Enterprise Linux7.9ppc64lefirefox91.4.0-1.el7_9firefox-91.4.0-1.el7_9.ppc64le.rpm
Red Hat Enterprise Linux7.9s390xfirefox91.4.0-1.el7_9firefox-91.4.0-1.el7_9.s390x.rpm
Red Hat Enterprise Linux7.9x86_64firefox91.4.0-1.el7_9firefox-91.4.0-1.el7_9.x86_64.rpm
Red Hat Enterprise Linux7.9ppc64firefox-debuginfo91.4.0-1.el7_9firefox-debuginfo-91.4.0-1.el7_9.ppc64.rpm
Red Hat Enterprise Linux7.9ppc64lefirefox-debuginfo91.4.0-1.el7_9firefox-debuginfo-91.4.0-1.el7_9.ppc64le.rpm
Red Hat Enterprise Linux7.9s390xfirefox-debuginfo91.4.0-1.el7_9firefox-debuginfo-91.4.0-1.el7_9.s390x.rpm
Red Hat Enterprise Linux7.9x86_64firefox-debuginfo91.4.0-1.el7_9firefox-debuginfo-91.4.0-1.el7_9.x86_64.rpm

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25 Jun 2026 10:59Current
7.3High risk
Vulners AI Score7.3
CVSS 24.3
CVSS 3.16.5
EPSS0.01714
CWE-209
XMLHttpRequest error codesexternal protocol handlersidentify installed applicationsThunderbirdFirefox browsers
5