CVE-2021-38500

Description

Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

8.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.66% Top 30%

Vendor Advisory debian.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Thunderbird

Affected: Mozilla Firefox ESR

Affected: Mozilla Firefox

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2021-47/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-45/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-43/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-46/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-44/	vendor advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1725854%2C1728321	issue tracking broken link
https://www.debian.org/security/2022/dsa-5034	vendor advisory third party advisory issue tracking
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html	third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-38500?: CVE-2021-38500 has been scored as a high severity vulnerability.
How to fix CVE-2021-38500?: To fix CVE-2021-38500, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-38500 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-38500 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-38500?: CVE-2021-38500 affects Mozilla Thunderbird, Mozilla Firefox ESR, Mozilla Firefox.

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