CVE-2020-12401
Summary
| CVE | CVE-2020-12401 |
|---|---|
| State | PUBLISHED |
| Assigner | mozilla |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2020-10-08 14:15:11 UTC |
| Updated | 2026-08-19 15:29:21 UTC |
| Description | During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed, resulting in variable-time execution dependent on secret data. This vulnerability affects Firefox < 80 and Firefox for Android < 80. |
Risk And Classification
Primary CVSS: v3.1 4.7 MEDIUM from [email protected]
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.003230000 probability, percentile 0.251960000 (date 2026-08-19)
Problem Types: CWE-203 | Timing-attack on ECDSA signature generation
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 4.7 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |
| 2.0 | [email protected] | Primary | 1.9 | AV:L/AC:M/Au:N/C:P/I:N/A:N |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
HighPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
NoneCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v2.0 Breakdown
Access Vector
LocalAccess Complexity
MediumAuthentication
NoneConfidentiality
PartialIntegrity
NoneAvailability
NoneAV:L/AC:M/Au:N/C:P/I:N/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Mozilla | Firefox | All | All | All | All |
| Application | Mozilla | Firefox Mobile | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Mozilla | Firefox | affected unspecified 80 custom | Not specified |
| CNA | Mozilla | Firefox For Android | affected unspecified 80 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Security Vulnerabilities fixed in Firefox 80 — Mozilla | af854a3a-2127-422b-91ae-364da2661108 | www.mozilla.org | Vendor Advisory |
| Security Vulnerabilities fixed in Firefox for Android 80 — Mozilla | af854a3a-2127-422b-91ae-364da2661108 | www.mozilla.org | Vendor Advisory |
| [SECURITY] [DLA 3327-1] nss security update | af854a3a-2127-422b-91ae-364da2661108 | lists.debian.org | |
| Access Denied | af854a3a-2127-422b-91ae-364da2661108 | bugzilla.mozilla.org | Issue Tracking, Permissions Required, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 181594 Debian Security Update for nss (DLA 3327-1)
- 352469 Amazon Linux Security Advisory for nspr, nss-softokn, nss-util: ALAS-2021-1522
- 377524 Alibaba Cloud Linux Security Update for nss and nspr (ALINUX2-SA-2020:0173)
- 500458 Alpine Linux Security Update for nss
- 500953 Alpine Linux Security Update for firefox
- 503838 Alpine Linux Security Update for firefox
- 960725 Rocky Linux Security Update for nss (RLSA-2021:0538)