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Mozilla: Port blocking could be bypassed

🗓️ 26 Apr 2021 06:21:35Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

Port blocking bypass via Alt-Svc header using 16-bit overflow affects Firefox Extended Support Release 78.10, Thunderbird 78.10, and Firefox 88.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities of Mozilla Firefox (less than Firefox 78.14.0 ESR + CVE-2021-29967) have affected Synthetic Playback Agent 8.1.4.0-8.1.4 IF14
28 Sep 202116:45
–ibm
IBM Security Bulletins		Security Bulletin: IBM Cloud Pak for Multicloud Management Monitoring has applied security fixes for its use of Mozilla Firefox
1 Dec 202115:06
–ibm
ALT Linux		Security fix for the ALT Linux 10 package firefox-esr version 78.10.0-alt1
21 Apr 202100:00
–altlinux
ALT Linux		Security fix for the ALT Linux 10 package thunderbird version 78.10.0-alt1
26 Apr 202100:00
–altlinux
ATTACKERKB		CVE-2021-29946
24 Jun 202114:15
–attackerkb
Tenable Nessus		Amazon Linux 2 : thunderbird (ALAS-2021-1644)
24 May 202100:00
–nessus
Tenable Nessus		CentOS 8 : thunderbird (CESA-2021:1353)
27 Apr 202100:00
–nessus
Tenable Nessus		CentOS 8 : firefox (CESA-2021:1360)
3 May 202100:00
–nessus
Tenable Nessus		CentOS 7 : thunderbird (RHSA-2021:1350)
9 Oct 202400:00
–nessus
Tenable Nessus		CentOS 7 : firefox (RHSA-2021:1363)
9 Oct 202400:00
–nessus
Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux7.9ppc64lethunderbird78.10.0-1.el7_9thunderbird-78.10.0-1.el7_9.ppc64le.rpm
Red Hat Enterprise Linux7.9x86_64thunderbird78.10.0-1.el7_9thunderbird-78.10.0-1.el7_9.x86_64.rpm
Red Hat Enterprise Linux7.9ppc64lethunderbird-debuginfo78.10.0-1.el7_9thunderbird-debuginfo-78.10.0-1.el7_9.ppc64le.rpm
Red Hat Enterprise Linux7.9x86_64thunderbird-debuginfo78.10.0-1.el7_9thunderbird-debuginfo-78.10.0-1.el7_9.x86_64.rpm

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25 Jun 2026 10:57Current
7.4High risk
Vulners AI Score7.4
CVSS 26.8
CVSS 3.18.8
EPSS0.01167
CWE-190
port blockingalt service headersixteen bit overflowfirefox extended supportthunderbirdfirefox browser
4