CVE-2021-38492

Public Exploit

Description

When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. *This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92, Thunderbird < 91.1, Thunderbird < 78.14, Firefox ESR < 78.14, and Firefox ESR < 91.1.

6.5

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.24%

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

Affected: Mozilla Firefox

Affected: Mozilla Thunderbird

Affected: Mozilla Firefox ESR

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2021-40/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-41/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-38/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-42/	vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-39/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1721107	vendor advisory issue tracking exploit
https://security.gentoo.org/glsa/202208-14	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-38492?: CVE-2021-38492 has been scored as a medium severity vulnerability.
How to fix CVE-2021-38492?: To fix CVE-2021-38492, 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-2021-38492 being actively exploited in the wild?: It is possible that CVE-2021-38492 is being exploited or will be exploited in a near future based on public information. 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-2021-38492?: CVE-2021-38492 affects Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR.

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