vulnerability
Ubuntu: (Multiple Advisories) (CVE-2021-23978): Firefox vulnerabilities
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:N/AC:M/Au:N/C:P/I:P/A:P) | Feb 25, 2021 | Feb 27, 2021 | Mar 27, 2026 |
Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
Feb 25, 2021
Added
Feb 27, 2021
Modified
Mar 27, 2026
Description
Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
Solutions
ubuntu-upgrade-firefoxubuntu-upgrade-thunderbird
Rapid7 Labs
2026 Global Threat Landscape Report
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