CVE-2021-23974

Description

The DOMParser API did not properly process '<noscript>' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.

6.1

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.11%

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

Affected: Mozilla Firefox

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2021-07/	release notes vendor advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1528997%2C1683627	issue tracking vendor advisory
https://security.gentoo.org/glsa/202104-10	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-23974?: CVE-2021-23974 has been scored as a medium severity vulnerability.
How to fix CVE-2021-23974?: To fix CVE-2021-23974, 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-2021-23974 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-23974 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-2021-23974?: CVE-2021-23974 affects Mozilla Firefox.

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