Mozilla has released security updates for its browsers Firefox and Firefox ESR and mailing client Thunderbird. There are 13  vulnerabilities in Firefox, ten vulnerabilities in Firefox ESR, and 11 vulnerabilities in Thunderbirbird that have been found and fixed. The advisories for these products have been rated high severity. Most of these vulnerabilities could lead to Use-after-free, heap buffer overflow, and sensitive information disclosure.


Mozilla Security Updates Summary for December 2021

Product: Mozilla Firefox
Advisory/CVEs: 
MFSA2021-52CVE-2021-43536CVE-2021-43537CVE-2021-43538CVE-2021-43539CVE-2021-43540CVE-2021-43541CVE-2021-43542CVE-2021-43543CVE-2021-43544CVE-2021-43545CVE-2021-43546
Severity: 
High
Impact: 
Use-after-free, heap buffer overflow, sensitive information disclosure, security bypass, and denial of service.


Product: Mozilla Firefox ESR
Advisory/CVEs: 
MFSA2021-53CVE-2021-43536CVE-2021-43537CVE-2021-43538CVE-2021-43539CVE-2021-43541CVE-2021-43542CVE-2021-43543CVE-2021-43545CVE-2021-43546
Severity: 
High
Impact: 
Use-after-free, heap buffer overflow, sensitive information disclosure, security bypass, and denial of service.


Product: Mozilla Thunderbird
Advisory/CVEs: 
MFSA2021-54CVE-2021-43536CVE-2021-43537CVE-2021-43538CVE-2021-43539CVE-2021-43541CVE-2021-43542CVE-2021-43543CVE-2021-43545CVE-2021-43546
Severity: 
High
Impact: 
Use-after-free, heap buffer overflow, sensitive information disclosure, security bypass, and denial of service.


Affected Products:

Mozilla Firefox below 95.0
Mozilla Firefox ESR below 91.4
Mozilla Thunderbird below 91.4


Solution:

Mozilla Firefox 95.0
Mozilla Firefox ESR 91.4
Mozilla Thunderbird 91.4


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