CVE-2020-12400

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

Score 4.7 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 4.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.7Exploit: NoneExposed: 0

A fix is available — apply it.

When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

CVSS v3
4.7
EG Score
4.7(medium)
EPSS
18.7%
KEV
Not listed

Published

October 8, 2020

Last Modified

November 21, 2024

References (8)

Vendor Advisories for CVE-2020-12400(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibnss3-tools (2:3.28.4-0ubuntu0.16.04.13) @ xenial2026-05-23ubuntu
ubuntufirefox-mozsymbols (80.0+build2-0ubuntu0.16.04.1) @ xenial2026-05-23ubuntu
redhatopenshiftdo/odo-init-image-rhel7:1.1.3-22021-03-22redhat
redhatnss-0:3.53.1-17.el8_32021-02-16redhat
redhatnss-util-0:3.53.1-1.el7_92020-09-29redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:33 UTCEG score recompute
  2. 2026-07-22 14:05 UTCEPSS rescore
  3. 2026-07-21 15:22 UTCEPSS rescore
  4. 2026-07-21 15:22 UTCEPSS rescore
  5. 2026-07-20 17:04 UTCEPSS rescore
  6. 2026-07-19 14:28 UTCEPSS rescore
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  8. 2026-07-19 02:26 UTCEPSS rescore
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  11. 2026-07-16 16:59 UTCEPSS rescore
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  14. 2026-07-13 22:27 UTCEPSS rescore
  15. 2026-07-13 06:10 UTCEPSS rescore
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  17. 2026-07-13 01:38 UTCOSV refresh
  18. 2026-07-12 05:44 UTCEPSS rescore
  19. 2026-07-11 08:24 UTCEPSS rescore
  20. 2026-07-09 19:06 UTCEPSS rescore
  21. 2026-07-08 15:11 UTCEPSS rescore
  22. 2026-07-07 13:43 UTCEPSS rescore
  23. 2026-07-06 16:25 UTCEPSS rescore
  24. 2026-07-06 16:25 UTCEPSS rescore
  25. 2026-07-06 02:20 UTCEPSS rescore
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  1. 2026-07-05 02:27 UTCEPSS rescore
  2. 2026-07-04 06:28 UTCEPSS rescore
  3. 2026-07-01 15:03 UTCEPSS rescore
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  5. 2026-06-30 23:20 UTCEPSS rescore
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  7. 2026-06-29 14:04 UTCEPSS rescore
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  9. 2026-06-28 14:05 UTCEPSS rescore
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  12. 2026-06-27 03:06 UTCEPSS rescore
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  15. 2026-06-24 14:03 UTCEPSS rescore
  16. 2026-06-24 14:03 UTCEPSS rescore
  17. 2026-06-24 11:20 UTCOSV refresh
  18. 2026-06-23 21:31 UTCEPSS rescore
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  20. 2026-06-22 14:23 UTCEPSS rescore
  21. 2026-06-22 14:23 UTCEPSS rescore
  22. 2026-06-21 14:54 UTCEPSS rescore
  23. 2026-06-21 14:54 UTCEPSS rescore
  24. 2026-06-21 01:57 UTCEPSS rescore
  25. 2026-06-21 01:57 UTCEPSS rescore
  26. 2026-06-19 19:23 UTCEPSS rescore
  27. 2026-06-19 19:23 UTCEPSS rescore
  28. 2026-06-18 17:50 UTCEPSS rescore
  29. 2026-06-18 17:50 UTCEPSS rescore
  30. 2026-06-17 17:50 UTCEPSS rescore
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  37. 2026-06-13 22:58 UTCEPSS rescore
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  39. 2026-06-12 23:09 UTCEPSS rescore
  40. 2026-06-11 13:58 UTCEPSS rescore
  41. 2026-06-10 22:16 UTCEPSS rescore
  42. 2026-06-10 22:16 UTCEPSS rescore
  43. 2026-06-10 13:20 UTCEPSS rescore
  44. 2026-06-08 14:15 UTCEPSS rescore
  45. 2026-06-08 14:15 UTCEPSS rescore
  46. 2026-06-07 15:39 UTCOSV refresh
  47. 2026-06-07 15:23 UTCEPSS rescore
  48. 2026-06-07 15:23 UTCEPSS rescore
  49. 2026-06-06 13:45 UTCEPSS rescore
  50. 2026-06-06 13:45 UTCEPSS rescore
  51. 2026-06-06 13:45 UTCEPSS rescore
  52. 2026-06-05 22:45 UTCEPSS rescore
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  54. 2026-06-05 06:08 UTCEPSS rescore
  55. 2026-06-04 13:10 UTCEPSS rescore
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  57. 2026-06-02 20:11 UTCEPSS rescore
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  59. 2026-06-01 13:50 UTCEPSS rescore
  60. 2026-05-31 22:29 UTCEPSS rescore
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  62. 2026-05-31 00:15 UTCEPSS rescore
  63. 2026-05-31 00:14 UTCEPSS rescore
  64. 2026-05-29 13:42 UTCEPSS rescore
  65. 2026-05-29 13:42 UTCEPSS rescore
  66. 2026-05-28 13:43 UTCEPSS rescore
  67. 2026-05-28 13:43 UTCEPSS rescore
  68. 2026-05-27 13:39 UTCEPSS rescore
  69. 2026-05-26 13:42 UTCEPSS rescore
  70. 2026-05-26 13:42 UTCEPSS rescore
  71. 2026-05-26 07:17 UTCEPSS rescore
  72. 2026-05-26 07:17 UTCEPSS rescore
  73. 2026-05-23 06:54 UTCEG score recompute
  74. 2026-05-23 06:54 UTCVendor advisory
  75. 2026-05-23 06:54 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2020-12400?
CVE-2020-12400 is a medium vulnerability published on October 8, 2020. When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
When was CVE-2020-12400 disclosed?
CVE-2020-12400 was first published in the National Vulnerability Database on October 8, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-12400 actively exploited?
CVE-2020-12400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-12400?
CVE-2020-12400 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2020-12400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-12400, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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