Vulnerability Description
If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 85.0 |
| Mozilla | Firefox Esr | < 78.7 |
| Mozilla | Thunderbird | < 78.7 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1683940Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-03/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-04/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-05/Release NotesVendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1683940Issue TrackingPermissions RequiredVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-03/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-04/Release NotesVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-05/Release NotesVendor Advisory
FAQ
What is CVE-2021-23953?
CVE-2021-23953 is a vulnerability with a CVSS score of 4.3 (MEDIUM). If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. This vulnerability affects F...
How severe is CVE-2021-23953?
CVE-2021-23953 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-23953?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.