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CVE Record

CVE-2017-3730: Bad (EC)DHE parameters cause a client crash

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This OpenSSL flaw can let a malicious TLS server crash a vulnerable client during key exchange. The business impact is service disruption for client-side systems that connect to untrusted or attacker-controlled servers, not data theft based on the provided sources.

Executive priority

Treat this as a cleanup and availability-risk item, not an emergency breach indicator. Prioritize remediation where business-critical clients connect to untrusted networks or where old OpenSSL is embedded in appliances or legacy applications.

Technical view

OpenSSL 1.1.0 through 1.1.0c can dereference a NULL pointer when processing bad DHE or ECDHE parameters supplied by a server. The issue affects clients and was fixed in OpenSSL 1.1.0d, according to the CVE bundle and OpenSSL advisory references.

Likely exposure

Exposure is likely limited to systems still running OpenSSL 1.1.0, 1.1.0a, 1.1.0b, or 1.1.0c in TLS client roles. Modern supported platforms are unlikely to remain affected unless they bundle old OpenSSL libraries.

Exploitation context

The bundle includes an Exploit-DB reference, so public exploit material exists. KEV is false, and the provided sources do not establish active exploitation. Exploitation requires a vulnerable client to connect to a malicious server using affected DHE or ECDHE handling.

Researcher notes

The public record identifies a NULL pointer dereference in client-side DHE/ECDHE parameter processing. The source bundle lacks CVSS and CWE details. Avoid assuming server-side compromise, data exposure, or active exploitation beyond the referenced public exploit listing.

Mitigation direction

  • Upgrade affected OpenSSL 1.1.0 through 1.1.0c installations to 1.1.0d or later.
  • Apply operating system or appliance vendor security updates that include the OpenSSL fix.
  • Prioritize client systems that connect to external or untrusted TLS servers.
  • Check vendor advisories for bundled OpenSSL in products and appliances.
  • Retire unsupported software stacks carrying obsolete OpenSSL builds.

Validation and detection

  • Inventory OpenSSL versions in servers, endpoints, containers, appliances, and bundled applications.
  • Confirm no TLS client workload uses OpenSSL 1.1.0 through 1.1.0c.
  • Review SBOMs and vendor notices for embedded OpenSSL dependencies.
  • Validate patched systems report a fixed or vendor-backported OpenSSL package.
  • Check exposure paths where clients connect to internet-hosted or partner-controlled TLS services.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2017-3730 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
OpenSSLOpenSSLopenssl-1.1.0, openssl-1.1.0a, openssl-1.1.0b, openssl-1.1.0cListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.