CVE-2021-23968

Description

If Content Security Policy blocked frame navigation, the full destination of a redirect served in the frame was reported in the violation report; as opposed to the original frame URI. This could be used to leak sensitive information contained in such URIs. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.78% Top 30%
Vendor Advisory debian.org Vendor Advisory gentoo.org Vendor Advisory gentoo.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
Published at:
Updated at:

References

Link Tags
https://www.mozilla.org/security/advisories/mfsa2021-07/ release notes vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-09/ release notes vendor advisory
https://www.mozilla.org/security/advisories/mfsa2021-08/ release notes vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1687342 issue tracking permissions required vendor advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html third party advisory mailing list
https://www.debian.org/security/2021/dsa-4866 third party advisory vendor advisory
https://security.gentoo.org/glsa/202104-10 third party advisory vendor advisory
https://security.gentoo.org/glsa/202104-09 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-23968?
CVE-2021-23968 has been scored as a medium severity vulnerability.
How to fix CVE-2021-23968?
To fix CVE-2021-23968, 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-2021-23968 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-23968 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-2021-23968?
CVE-2021-23968 affects Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR.
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