CVE-2020-12399

MEDIUM

Firefox < 77.0 and Firefox ESR < 68.9.0 - Timing Side-Channel in DSA Signature Verification

Title source: llm
STIX 2.1

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.

References (8)

Core 8
Core References
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1631576
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2020/dsa-4726
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4421-1/
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202007-49
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html

Scores

CVSS v3 4.4
EPSS 0.0010
EPSS Percentile 26.5%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

Details

CWE
CWE-203
Status published
Products (4)
debian/debian_linux 9.0
mozilla/firefox < 77.0
mozilla/firefox_esr < 68.9.0
mozilla/thunderbird < 68.9.0
Published Jul 09, 2020
Tracked Since Feb 18, 2026