PT-2021-2749 · Mozilla+7 · Firefox+9
Frederik Braun
·
Published
2021-04-19
·
Updated
2024-12-12
·
CVE-2021-29946
CVSS v3.1
8.8
High
| Vector | AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions:
Firefox ESR versions prior to 78.10
Thunderbird versions prior to 78.10
Firefox versions prior to 88
Description:
The issue exists due to insufficient input validation, allowing a remote attacker to bypass security restrictions. This can be exploited when using the Alt-Svc header with ports written as an integer overflow above the bounds of a 16-bit integer, potentially bypassing port blocking restrictions.
Recommendations:
For Firefox ESR versions prior to 78.10, update to version 78.10 or later.
For Thunderbird versions prior to 78.10, update to version 78.10 or later.
For Firefox versions prior to 88, update to version 88 or later.
Exploit
Fix
RCE
Integer Overflow
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Related Identifiers
Affected Products
Alt Linux
Astra Linux
Centos
Firefox
Firefox Esr
Linuxmint
Red Hat
Suse
Thunderbird
Ubuntu