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Vulnerability details: VCID-e8wz-a6j9-ybas
Vulnerability ID VCID-e8wz-a6j9-ybas
Aliases CVE-2020-12399
Summary NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-203 Observable Discrepancy
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
System Score Found at
cvssv3 4.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12399.json
epss 0.0008 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.0008 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.0008 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.0008 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.0008 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
epss 0.00101 https://api.first.org/data/v1/epss?cve=CVE-2020-12399
cvssv3.1 4.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 1.2 https://nvd.nist.gov/vuln/detail/CVE-2020-12399
cvssv3.1 4.4 https://nvd.nist.gov/vuln/detail/CVE-2020-12399
archlinux High https://security.archlinux.org/AVG-1173
archlinux High https://security.archlinux.org/AVG-1179
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-20
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-21
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2020-22
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12399.json
https://api.first.org/data/v1/epss?cve=CVE-2020-12399
https://bugzilla.mozilla.org/show_bug.cgi?id=1631576
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17006
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17023
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12398
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12399
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12402
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12405
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12406
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12410
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html
https://security.gentoo.org/glsa/202007-49
https://www.debian.org/security/2020/dsa-4726
https://www.mozilla.org/security/advisories/mfsa2020-20/
https://www.mozilla.org/security/advisories/mfsa2020-21/
https://www.mozilla.org/security/advisories/mfsa2020-22/
1826177 https://bugzilla.redhat.com/show_bug.cgi?id=1826177
961752 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=961752
ASA-202006-1 https://security.archlinux.org/ASA-202006-1
ASA-202006-4 https://security.archlinux.org/ASA-202006-4
AVG-1173 https://security.archlinux.org/AVG-1173
AVG-1179 https://security.archlinux.org/AVG-1179
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2020-12399 https://nvd.nist.gov/vuln/detail/CVE-2020-12399
mfsa2020-20 https://www.mozilla.org/en-US/security/advisories/mfsa2020-20
mfsa2020-21 https://www.mozilla.org/en-US/security/advisories/mfsa2020-21
mfsa2020-22 https://www.mozilla.org/en-US/security/advisories/mfsa2020-22
RHSA-2020:3280 https://access.redhat.com/errata/RHSA-2020:3280
USN-4383-1 https://usn.ubuntu.com/4383-1/
USN-4397-1 https://usn.ubuntu.com/4397-1/
USN-4397-2 https://usn.ubuntu.com/4397-2/
USN-4421-1 https://usn.ubuntu.com/4421-1/
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-12399.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:L/AC:H/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12399
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-12399
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.24419
EPSS Score 0.0008
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:38.760813+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2020/mfsa2020-22.yml 37.0.0