vulnerability
MFSA2020-21 Firefox: Security Vulnerabilities fixed in Firefox ESR 68.9 (CVE-2020-12399)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 1 | (AV:L/AC:H/Au:N/C:P/I:N/A:N) | Jun 2, 2020 | Jun 3, 2020 | Mar 27, 2026 |
Severity
1
CVSS
(AV:L/AC:H/Au:N/C:P/I:N/A:N)
Published
Jun 2, 2020
Added
Jun 3, 2020
Modified
Mar 27, 2026
Description
NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
Solution
mozilla-firefox-esr-upgrade-68_9
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.