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TI-2020-09919 Aliases CVE-2020-12401GHSA-cm2q-67xf-jw8c

Observable discrepancy in Mozilla Firefox

Priority LOW 22CWE-203Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 9 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-203.

Summary

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.

Why it matters now

EPSS 0.00326 25th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 80Firefox for Android (Mozilla): 80Red Hat: 3 advisoriesRed Hat: 9 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 8080Patch availableCNA
MozillaFirefox for Androidbefore 8080Patch availableCNA
  • Firefox VendorMozilla Affected before 80 Fixed in 80 Patch available CNA
  • Firefox for Android VendorMozilla Affected before 80 Fixed in 80 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 80.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:android:*:*before 80.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 80.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:android:*:* Versions before 80.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 80
  • Fix · CNA Firefox for Android (Mozilla) Fixed in 80

Red Hat 3 advisories

  • RHSA-2021:0949 Released 2021-03-22 · Red Hat rating Low
    Red Hat OpenShift Do openshift/odo-init-image 1.1.3 security update
    • OpenShift Do 1 openshiftdo/odo-init-image-rhel7
  • RHSA-2021:0538 Released 2021-02-16 · Red Hat rating Moderate
    nss security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 8) nss-3.53.1-17.el8_3, nss-devel-3.53.1-17.el8_3, nss-softokn-3.53.1-17.el8_3 +7
  • RHSA-2020:4076 Released 2020-09-29 · Red Hat rating Moderate
    nss and nspr security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) nspr-4.25.0-2.el7_9, nss-3.53.1-3.el7_9, nss-softokn-3.53.1-6.el7_9 +4
    • Red Hat Enterprise Linux Client Optional (v. 7) nspr-devel-4.25.0-2.el7_9, nss-devel-3.53.1-3.el7_9, nss-pkcs11-devel-3.53.1-3.el7_9 +3
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) nspr-devel-4.25.0-2.el7_9, nss-devel-3.53.1-3.el7_9, nss-pkcs11-devel-3.53.1-3.el7_9 +3
    • Red Hat Enterprise Linux Server (v. 7) nspr-4.25.0-2.el7_9, nspr-4.25.0-2.el7_9.ppc, nspr-devel-4.25.0-2.el7_9 +19
    • Red Hat Enterprise Linux Server Optional (v. 7) nss-pkcs11-devel-3.53.1-3.el7_9, nss-pkcs11-devel-3.53.1-3.el7_9.ppc
    • Red Hat Enterprise Linux Workstation (v. 7) nspr-4.25.0-2.el7_9, nspr-devel-4.25.0-2.el7_9, nss-3.53.1-3.el7_9 +9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) nss-pkcs11-devel-3.53.1-3.el7_9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox, Firefox for Android 80

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2020-09918 Observable discrepancy in Mozilla FirefoxPriority LOW 21
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
OpenShift Do 1Fixed RHSA-2021:0949
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:0538
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4076
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:4076

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-12401
  2. 2026-10-03 Alias added: GHSA-cm2q-67xf-jw8c

References

Advisory 3

Other 1

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences