CVE-2021-38505
First published: Tue Nov 02 2021(Updated: )
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.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <91.3 | 91.3 |
| <94 | 94 | |
| <91.3 | 91.3 | |
| <91.3 | 91.3 | |
| Mozilla Firefox | <94.0 | |
| Mozilla Firefox ESR | <91.3.0 | |
| Mozilla Thunderbird | <91.3.0 | |
| Microsoft Windows 10 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1730194
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/
- https://www.mozilla.org/security/advisories/mfsa2021-48/
- https://www.mozilla.org/security/advisories/mfsa2021-49/
- https://www.mozilla.org/security/advisories/mfsa2021-50/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2021-38505?
CVE-2021-38505 is a vulnerability in Microsoft Windows 10, where the Cloud Clipboard feature records data copied to the clipboard to the cloud.
How does CVE-2021-38505 affect Mozilla Thunderbird?
CVE-2021-38505 affects Mozilla Thunderbird versions up to and excluding 91.3.0
How does CVE-2021-38505 affect Mozilla Firefox?
CVE-2021-38505 affects Mozilla Firefox versions up to and excluding 94.0
Is Microsoft Windows 10 affected by CVE-2021-38505?
No, Microsoft Windows 10 is not vulnerable to CVE-2021-38505
What is the severity of CVE-2021-38505?
CVE-2021-38505 has a severity value of 6.5 (High)
- collector/mozilla-advisory
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- agent/tags
- collector/nvd-index
- collector/mitre-cve
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- vendor/mozilla
- canonical/mozilla firefox esr
- canonical/mozilla thunderbird
- canonical/mozilla firefox
- vendor/microsoft
- canonical/microsoft windows 10