Vulnerability Details : CVE-2021-38505
Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user's Microsoft account. *This bug only affects Firefox for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Products affected by CVE-2021-38505
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*When used together with: Microsoft » Windows 10
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*When used together with: Microsoft » Windows 10
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*When used together with: Microsoft » Windows 10
Exploit prediction scoring system (EPSS) score for CVE-2021-38505
0.45%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 61 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-38505
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2021-38505
-
The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-38505
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1730194
Access DeniedIssue Tracking;Permissions Required;Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-50/
Security Vulnerabilities fixed in Thunderbird 91.3 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-49/
Security Vulnerabilities fixed in Firefox ESR 91.3 — MozillaVendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-48/
Security Vulnerabilities fixed in Firefox 94 — MozillaVendor Advisory
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