CVE-2017-3730

HIGHNVD 7.58.2
EchelonGraph scoreHIGH confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score elevated to 8.2 because EPSS predicted 55% probability of exploitation within the next 30 days (99th percentile of EPSS-scored CVEs) when EchelonGraph scored this CVE. NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction (continuous uplift above 30%)
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this weekElevated
8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High exploitation likelihood — EPSS 55%
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 55%CVSS: 7.5Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

In OpenSSL 1.1.0 before 1.1.0d, if a malicious server supplies bad parameters for a DHE or ECDHE key exchange then this can result in the client attempting to dereference a NULL pointer leading to a client crash. This could be exploited in a Denial of Service attack.

CVSS v3
7.5
EG Score
8.2HIGHhigh confidence
EG Risk
59
EG Risk 59/100

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 (value × EchelonGraph’s weight)
Severity82% × 45%
The EG Score, 8.2 of 10.
Exploitation55% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
55%
EPSS %ILE
99th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 4, 2017

Last Modified

June 17, 2026

References (10)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • every version up to 1.1.0d-1: fixed in 1.1.0d-1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • every version up to 1.1.0d-1: fixed in 1.1.0d-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • every version up to 1.1.0d-1: fixed in 1.1.0d-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
openssl—
  • every version up to 1.1.0d-1: fixed in 1.1.0d-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 19× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 84 of 120 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 16 repeat rows among the latest 100 are merged into the row they repeat. The 36 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:28 UTCEPSS rescoreEPSS 55% · 99th percentile
  2. 2026-10-12 00:51 UTCEG score recompute
  3. 2026-10-11 13:41 UTCEPSS rescoreEPSS 55% · 99th percentile
  4. 2026-10-10 19:55 UTCEPSS rescoreEPSS 55% · 99th percentile
  5. 2026-10-09 20:02 UTCEPSS rescoreEPSS 55% · 99th percentile
  6. 2026-10-08 16:36 UTCEPSS rescoreEPSS 55% · 99th percentile
  7. 2026-10-08 06:24 UTCOSV refresh
  8. 2026-10-07 23:41 UTCEPSS rescoreEPSS 55% · 99th percentile
  9. 2026-10-06 15:12 UTCEPSS rescoreEPSS 55% · 99th percentile
  10. 2026-10-03 14:21 UTCEPSS rescoreEPSS 55% · 99th percentile
  11. 2026-09-30 14:59 UTCEPSS rescoreEPSS 55% · 99th percentile
  12. 2026-09-30 09:33 UTCEG score recompute
  13. 2026-09-27 13:40 UTCEPSS rescoreEPSS 55% · 99th percentile
  14. 2026-09-26 15:53 UTCEPSS rescoreEPSS 55% · 99th percentile
  15. 2026-09-24 13:59 UTCEPSS rescoreEPSS 55% · 98th percentile
  16. 2026-09-18 19:22 UTCEPSS rescoreEPSS 55% · 98th percentile
  17. 2026-09-18 12:06 UTCOSV refresh
  18. 2026-09-17 19:22 UTCEPSS rescoreEPSS 55% · 98th percentile
  19. 2026-09-15 03:05 UTCEPSS rescoreEPSS 55% · 98th percentile
  20. 2026-09-12 14:55 UTCEPSS rescoreEPSS 55% · 98th percentile
  21. 2026-09-06 13:43 UTCEPSS rescoreEPSS 55% · 98th percentile
  22. 2026-09-05 15:23 UTCEPSS rescoreEPSS 50% · 98th percentile
  23. 2026-09-04 13:56 UTCEPSS rescoreEPSS 55% · 98th percentile
  24. 2026-09-02 14:07 UTCEPSS rescoreEPSS 55% · 98th percentile
  25. 2026-09-01 03:31 UTCEPSS rescoreEPSS 55% · 98th percentile
Show 59 more
  1. 2026-08-30 19:13 UTCEPSS rescoreEPSS 55% · 98th percentile
  2. 2026-08-30 12:42 UTCOSV refresh
  3. 2026-08-26 14:41 UTCEPSS rescoreEPSS 55% · 98th percentile
  4. 2026-08-25 13:44 UTCEPSS rescoreEPSS 55% · 98th percentile
  5. 2026-08-21 23:44 UTCEPSS rescoreEPSS 55% · 98th percentile
  6. 2026-08-20 22:51 UTCEPSS rescoreEPSS 55% · 98th percentile
  7. 2026-08-19 16:59 UTCEPSS rescoreEPSS 55% · 98th percentile
  8. 2026-08-18 13:43 UTCEPSS rescoreEPSS 55% · 98th percentile
  9. 2026-08-17 13:42 UTCEPSS rescoreEPSS 55% · 98th percentile
  10. 2026-08-16 14:51 UTCEPSS rescoreEPSS 55% · 98th percentile
  11. 2026-08-16 02:10 UTCEPSS rescoreEPSS 55% · 98th percentile
  12. 2026-08-15 01:26 UTCEPSS rescoreEPSS 55% · 98th percentile
  13. 2026-08-14 02:19 UTCOSV refresh
  14. 2026-08-12 13:46 UTCEPSS rescoreEPSS 55% · 98th percentile
  15. 2026-08-09 13:42 UTCEPSS rescoreEPSS 55% · 98th percentile
  16. 2026-08-06 13:42 UTCEPSS rescoreEPSS 55% · 98th percentile
  17. 2026-08-05 19:12 UTCEPSS rescoreEPSS 55% · 98th percentile
  18. 2026-08-01 04:11 UTCEPSS rescoreEPSS 55% · 98th percentile
  19. 2026-07-30 16:24 UTCEPSS rescoreEPSS 55% · 98th percentile
  20. 2026-07-30 01:26 UTCEPSS rescoreEPSS 55% · 98th percentile
  21. 2026-07-29 07:04 UTCOSV refresh
  22. 2026-07-28 15:32 UTCEPSS rescoreEPSS 55% · 98th percentile
  23. 2026-07-26 14:51 UTCEPSS rescoreEPSS 55% · 98th percentile
  24. 2026-07-23 01:29 UTCEG score recompute▲ 0.70
  25. 2026-07-22 22:09 UTCEG score recompute
  26. 2026-07-22 14:04 UTCEPSS rescoreEPSS 55% · 98th percentile
  27. 2026-07-20 17:04 UTCEPSS rescoreEPSS 55% · 98th percentile
  28. 2026-07-19 14:28 UTCEPSS rescoreEPSS 55% · 98th percentile
  29. 2026-07-19 02:26 UTCEPSS rescoreEPSS 55% · 98th percentile
  30. 2026-07-16 16:59 UTCEPSS rescoreEPSS 55% · 98th percentile
  31. 2026-07-15 16:54 UTCEPSS rescoreEPSS 55% · 98th percentile
  32. 2026-07-15 01:56 UTCEPSS rescoreEPSS 55% · 98th percentile
  33. 2026-07-13 22:26 UTCEPSS rescoreEPSS 55% · 98th percentile
  34. 2026-07-11 23:41 UTCOSV refresh
  35. 2026-07-11 08:24 UTCEPSS rescoreEPSS 55% · 98th percentile
  36. 2026-07-09 19:06 UTCEPSS rescoreEPSS 55% · 98th percentile
  37. 2026-07-06 02:20 UTCEPSS rescoreEPSS 55% · 98th percentile
  38. 2026-07-04 06:28 UTCEPSS rescoreEPSS 55% · 98th percentile
  39. 2026-07-02 16:54 UTCEPSS rescoreEPSS 55% · 98th percentile
  40. 2026-07-01 15:02 UTCEPSS rescoreEPSS 55% · 98th percentile
  41. 2026-06-28 04:53 UTCEPSS rescoreEPSS 55% · 98th percentile
  42. 2026-06-27 03:05 UTCEPSS rescoreEPSS 55% · 98th percentile
  43. 2026-06-25 13:47 UTCEPSS rescoreEPSS 55% · 98th percentile
  44. 2026-06-24 14:02 UTCEPSS rescoreEPSS 55% · 98th percentile
  45. 2026-06-23 21:30 UTCEPSS rescoreEPSS 55% · 98th percentile
  46. 2026-06-23 06:00 UTCOSV refresh
  47. 2026-06-21 14:54 UTCEPSS rescoreEPSS 55% · 98th percentile
  48. 2026-06-21 01:57 UTCEPSS rescoreEPSS 55% · 98th percentile
  49. 2026-06-17 17:50 UTCEPSS rescoreEPSS 55% · 98th percentile
  50. 2026-06-16 17:50 UTCEPSS rescoreEPSS 55% · 98th percentile
  51. 2026-06-15 17:45 UTCEPSS rescoreEPSS 55% · 98th percentile
  52. 2026-06-14 23:14 UTCEPSS rescoreEPSS 59% · 98th percentile
  53. 2026-06-13 22:57 UTCEPSS rescoreEPSS 59% · 98th percentile
  54. 2026-06-12 23:09 UTCEPSS rescoreEPSS 59% · 98th percentile
  55. 2026-06-10 22:15 UTCEPSS rescoreEPSS 59% · 98th percentile
  56. 2026-06-10 13:19 UTCEPSS rescoreEPSS 59% · 98th percentile
  57. 2026-06-08 14:14 UTCEPSS rescoreEPSS 59% · 98th percentile
  58. 2026-06-07 15:22 UTCEPSS rescoreEPSS 59% · 98th percentile
  59. 2026-06-06 13:45 UTCEPSS rescoreEPSS 59% · 98th percentile

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 Exploit-DB entry). Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-41192
    Published Jan 26, 2017

    OpenSSL 1.1.0 - Remote Client Denial of Service

    Open source ↗

Frequently asked(5)

What is CVE-2017-3730?
CVE-2017-3730 is a high-severity vulnerability; its CVE record was published on May 4, 2017. In OpenSSL 1.1.0 before 1.1.0d, if a malicious server supplies bad parameters for a DHE or ECDHE key exchange then this can result in the client attempting to dereference a NULL pointer leading to a client crash. This could be exploited in a Denial of Service attack.
When was CVE-2017-3730 made public?
CVE-2017-3730 was made public on January 26, 2017: that is the date its CVE record's CNA, OpenSSL Software Foundation, gives for when the vulnerability was made public. The CVE record itself was published on May 4, 2017. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2017-3730 actively exploited?
CVE-2017-3730 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 55% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-3730?
CVE-2017-3730 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.2 (HIGH).
How do I remediate CVE-2017-3730?
A fix for CVE-2017-3730 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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