CVE-2020-12401: mozilla firefox Observable Discrepancy
CVSS: 4.7v3.1MediumModified
AliasesALPINE-CVE-2020-12401UBUNTU-CVE-2020-12401DEBIAN-CVE-2020-12401
Published 08-10-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-12401 is a medium (CVSS 4.7) Observable Discrepancy vulnerability in mozilla firefox. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 24% of scored vulnerabilities.
CVSS score
4.7/10
010
Medium · v3.1 (NVD)EPSS score
0.33%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 14 · Related 9Timeline
- 08-10-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
5 scores · 4 sources · 2 versionsMedium 4.7Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:NSourcesAll 4 agree
- OSV · AlpineEcosystem advisory · calculated4.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated4.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated4.7MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Low 1.9Preferred score · NVD (NIST)
AV:L/AC:M/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
0.33%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
0.00 pp
From 0.32% on 18-09-2026
18-09-202618-10-2026
EPSS score0.33%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mozilla3 products
- firefox≥ unspecified, < 80 | < 80.0
- firefox for android≥ unspecified, < 80
- firefox_mobile< 80.0
Ubuntu2 products
- firefox< 80.0+build2-0ubuntu0.16.04.1 | < 80.0+build2-0ubuntu0.18.04.1 | < 80.0+build2-0ubuntu0.20.04.1
- nss< 2:3.28.4-0ubuntu0.14.04.5+esm7 | < 2:3.28.4-0ubuntu0.16.04.13 | < 2:3.35-2ubuntu2.11 | < 2:3.49.1-1ubuntu1.4
Alpine1 product
- nss< 3.55-r0
Debian1 product
- nss< 2:3.55-1
4 vendors · 7 products
References
12 links- www.mozilla.org/security/advisories/mfsa2020-39/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-36/Vendor Advisory
