CVE-2019-1547

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
Trending — 3 sources updated this week
4.7
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 4.7Exploit: NoneExposed: 0

A fix is available — apply it.

Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).

CVSS v3
4.7
EG Score
4.7(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity47% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
64.9%
KEV
Not listed

Published

September 10, 2019

Last Modified

November 21, 2024

References (70)

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenssl1.0 (1.0.2n-1ubuntu5.4) @ bionic2026-05-27ubuntu
ubuntulibssl1.0.0-udeb (1.0.1-4ubuntu5.44) @ precise2026-05-27ubuntu
ubuntuopenssl (1.1.1-1ubuntu2.1~18.04.6) @ bionic2026-05-27ubuntu
redhatopenssl-1:1.1.1c-15.el82020-04-28redhat
redhatopenssl2020-04-06redhat
redhatjbcs-httpd24-openssl-1:1.1.1c-16.jbcs.el72020-04-06redhat

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(1)

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

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 15× in last 7d / 47× 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. 2026-07-23 01:40 UTCEG score recompute
  2. 2026-07-22 22:20 UTCEG score recompute
  3. 2026-07-22 14:05 UTCEPSS rescore
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  8. 2026-07-20 06:34 UTCOSV refresh
  9. 2026-07-19 14:28 UTCEPSS rescore
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  25. 2026-07-09 19:06 UTCEPSS rescore
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  1. 2026-07-08 15:11 UTCEPSS rescore
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  3. 2026-07-06 16:25 UTCEPSS rescore
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  5. 2026-07-06 02:20 UTCEPSS rescore
  6. 2026-07-05 02:27 UTCEPSS rescore
  7. 2026-07-04 06:28 UTCEPSS rescore
  8. 2026-07-02 23:35 UTCOSV refresh
  9. 2026-07-01 15:03 UTCEPSS rescore
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  11. 2026-06-30 23:20 UTCEPSS rescore
  12. 2026-06-29 14:03 UTCEPSS rescore
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  16. 2026-06-27 03:06 UTCEPSS rescore
  17. 2026-06-25 13:47 UTCEPSS rescore
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  21. 2026-06-23 21:31 UTCEPSS rescore
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  28. 2026-06-19 19:23 UTCEPSS rescore
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  30. 2026-06-18 17:50 UTCEPSS rescore
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  34. 2026-06-14 23:15 UTCEPSS rescore
  35. 2026-06-14 23:15 UTCEPSS rescore
  36. 2026-06-14 18:43 UTCOSV refresh
  37. 2026-06-13 22:58 UTCEPSS rescore
  38. 2026-06-12 23:09 UTCEPSS rescore
  39. 2026-06-11 13:58 UTCEPSS rescore
  40. 2026-06-10 22:16 UTCEPSS rescore
  41. 2026-06-10 13:19 UTCEPSS rescore
  42. 2026-06-08 14:15 UTCEPSS rescore
  43. 2026-06-07 15:23 UTCEPSS rescore
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  45. 2026-06-06 13:45 UTCEPSS rescore
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  49. 2026-06-05 06:08 UTCEPSS rescore
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  53. 2026-06-02 20:11 UTCEPSS rescore
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  55. 2026-06-01 13:50 UTCEPSS rescore
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  59. 2026-05-31 00:14 UTCEPSS rescore
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  61. 2026-05-29 13:42 UTCEPSS rescore
  62. 2026-05-28 13:43 UTCEPSS rescore
  63. 2026-05-27 14:44 UTCEG score recompute
  64. 2026-05-27 14:44 UTCVendor advisory
  65. 2026-05-27 14:44 UTCGHSA enrichment
  66. 2026-05-27 13:38 UTCEPSS rescore
  67. 2026-05-26 13:42 UTCEPSS rescore
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  69. 2026-05-26 07:17 UTCEPSS rescore
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  71. 2026-05-26 07:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2019-1547?
CVE-2019-1547 is a medium vulnerability published on September 10, 2019. Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have…
When was CVE-2019-1547 disclosed?
CVE-2019-1547 was first published in the National Vulnerability Database on September 10, 2019, 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-2019-1547 actively exploited?
CVE-2019-1547 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-1547?
CVE-2019-1547 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2019-1547?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-1547, 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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