CVE-2021-29981

Description

An issue present in lowering/register allocation could have led to obscure but deterministic register confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability affects Firefox < 91 and Thunderbird < 91.

8.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.45%

Vendor Advisory gentoo.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

Affected: Mozilla Thunderbird

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2021-33/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-36/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1707774	vendor advisory issue tracking
https://security.gentoo.org/glsa/202202-03	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-29981?: CVE-2021-29981 has been scored as a high severity vulnerability.
How to fix CVE-2021-29981?: To fix CVE-2021-29981, 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-2021-29981 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-29981 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-29981?: CVE-2021-29981 affects Mozilla Firefox, Mozilla Thunderbird.

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