CVE-2021-23971

Description

When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect's Referrer-Policy. This would have potentially resulted in more information than intended by the original origin being provided to the destination of the redirect. This vulnerability affects Firefox < 86.

6.5

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.48%

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/	vendor advisory release notes
https://bugzilla.mozilla.org/show_bug.cgi?id=1678545	vendor advisory permissions required issue tracking
https://security.gentoo.org/glsa/202104-10	vendor advisory third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-23971?: CVE-2021-23971 has been scored as a medium severity vulnerability.
How to fix CVE-2021-23971?: To fix CVE-2021-23971, 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-2021-23971 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-23971 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-2021-23971?: CVE-2021-23971 affects Mozilla Firefox.

This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.