Public proof of conceptFix available

CVE-2017-3730

A public proof of concept exists; no exploitation attested.

Published2017-05-04
WeaknessCWE-476

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2017-05-0419:29CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-3730?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-3730?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

OpenSSL

Branch	Affected	Fixed in	Source
1.1	= 1.1.0	no fix published	NVD
1.1	= 1.1.0a	no fix published	NVD
1.1	= 1.1.0b	no fix published	NVD
1.1	= 1.1.0c	no fix published	NVD

Oracle jd edwards world security

Branch	Affected	Fixed in	Source
—	= a9.1	no fix published	NVD
—	= a9.2	no fix published	NVD
—	= a9.3	no fix published	NVD
—	= a9.4	no fix published	NVD

Oracle communications eagle lnp application processor

Branch	Affected	Fixed in	Source
10.0	= 10.0	no fix published	NVD
10.1	= 10.1	no fix published	NVD
10.2	= 10.2	no fix published	NVD

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

www.oracle.comPatch
www.oracle.comPatch
github.comPatch
www.openssl.orgPatch · Vendor Advisory
www.oracle.comPatch

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedHavocParasite/CVE-2017-3730

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-476read 2026-10-23
FIRST EPSSEPSS score55.3 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-05-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-3730?

Is CVE-2017-3730 actively exploited?

Active exploitation of CVE-2017-3730 has not been confirmed. Its EPSS score was 55.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-3730?

CVE-2017-3730 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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