vulnerability
Ubuntu: USN-7991-1 (CVE-2025-5270): Thunderbird vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:L/Au:N/C:C/I:N/A:N) | May 27, 2025 | Jun 26, 2025 | Feb 4, 2026 |
Severity
8
CVSS
(AV:N/AC:L/Au:N/C:C/I:N/A:N)
Published
May 27, 2025
Added
Jun 26, 2025
Modified
Feb 4, 2026
Description
In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled. This vulnerability affects Firefox < 139 and Thunderbird < 139.
Solution
ubuntu-upgrade-thunderbird
References
- CVE-2025-5270
- https://attackerkb.com/topics/CVE-2025-5270
- CWE-319
- UBUNTU-USN-7991-1
- URL-https://bugzilla.mozilla.org/show_bug.cgi?id=1910298
- URL-https://www.cve.org/CVERecord?id=CVE-2025-5270
- URL-https://www.mozilla.org/en-US/security/advisories/mfsa2025-42/#CVE-2025-5270
- URL-https://www.mozilla.org/security/advisories/mfsa2025-42/
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