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

Exp

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.

Published: 2017-05-04 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-3730 is rated High Exploit Risk (84.4/100): CVSS High severity, with high exploitation likelihood (EPSS 59.22%, 98th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +6.17% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-3730

EDB-ID Source Kind Published Link
41192 exploit_db edb 2017-01-26 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-3730

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-31 53.05% 59.22% +6.17%
2 2026-05-04 52.92% 53.05% +0.13%
3 2026-03-22 — 52.92% —

Full EPSS history (61 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-3730

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-3730

OS Trackers for CVE-2017-3730

vendor priority summary link
debian not yet assigned CVE-2017-3730 not yet assigned priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-3730
gentoo normal CVE-2017-3730: 1 GLSA(s) (201702-07), 1 atom(s) (dev-libs/openssl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-3730
redhat medium — https://access.redhat.com/security/cve/CVE-2017-3730
suse medium CVE-2017-3730 severity moderate: SUSE including 14 source package names (compat-openssl097g, compat-openssl098, …), 44 product×package rows across 14 product lines (SLES for SAP Applications 11 SP3, SUSE Linux Enterprise Desktop 12 SP1, … (14 product lines)): Known Not Affected 44. https://www.suse.com/security/cve/CVE-2017-3730/
ubuntu medium CVE-2017-3730 medium priority: Ubuntu including 2 source packages (openssl, openssl098), 10 status rows across 5 suites (precise, trusty, upstream, xenial, yakkety): not-affected 5, DNE 3, needs-triage 2. https://ubuntu.com/security/CVE-2017-3730

Affected software / configurations for CVE-2017-3730

Vendor Product Version Raw CPE
openssl openssl 1.1.0 cpe:2.3:a:openssl:openssl:1.1.0:*:*:*:*:*:*:*
openssl openssl 1.1.0a cpe:2.3:a:openssl:openssl:1.1.0a:*:*:*:*:*:*:*
openssl openssl 1.1.0b cpe:2.3:a:openssl:openssl:1.1.0b:*:*:*:*:*:*:*
openssl openssl 1.1.0c cpe:2.3:a:openssl:openssl:1.1.0c:*:*:*:*:*:*:*
oracle agile_engineering_data_management 6.1.3 cpe:2.3:a:oracle:agile_engineering_data_management:6.1.3:*:*:*:*:*:*:*
oracle agile_engineering_data_management 6.2.0 cpe:2.3:a:oracle:agile_engineering_data_management:6.2.0:*:*:*:*:*:*:*
oracle communications_application_session_controller 3.7.1 cpe:2.3:a:oracle:communications_application_session_controller:3.7.1:*:*:*:*:*:*:*
oracle communications_application_session_controller 3.8.0 cpe:2.3:a:oracle:communications_application_session_controller:3.8.0:*:*:*:*:*:*:*
oracle communications_eagle_lnp_application_processor 10.0 cpe:2.3:a:oracle:communications_eagle_lnp_application_processor:10.0:*:*:*:*:*:*:*
oracle communications_eagle_lnp_application_processor 10.1 cpe:2.3:a:oracle:communications_eagle_lnp_application_processor:10.1:*:*:*:*:*:*:*
oracle communications_eagle_lnp_application_processor 10.2 cpe:2.3:a:oracle:communications_eagle_lnp_application_processor:10.2:*:*:*:*:*:*:*
oracle communications_operations_monitor 3.4 cpe:2.3:a:oracle:communications_operations_monitor:3.4:*:*:*:*:*:*:*
oracle communications_operations_monitor 4.0 cpe:2.3:a:oracle:communications_operations_monitor:4.0:*:*:*:*:*:*:*
oracle jd_edwards_enterpriseone_tools 9.2 cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:9.2:*:*:*:*:*:*:*
oracle jd_edwards_world_security a9.1 cpe:2.3:a:oracle:jd_edwards_world_security:a9.1:*:*:*:*:*:*:*
oracle jd_edwards_world_security a9.2 cpe:2.3:a:oracle:jd_edwards_world_security:a9.2:*:*:*:*:*:*:*
oracle jd_edwards_world_security a9.3 cpe:2.3:a:oracle:jd_edwards_world_security:a9.3:*:*:*:*:*:*:*
oracle jd_edwards_world_security a9.4 cpe:2.3:a:oracle:jd_edwards_world_security:a9.4:*:*:*:*:*:*:*

References for CVE-2017-3730

URL Tags
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html Patch
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html Patch
http://www.securityfocus.com/bid/95812 Broken Link Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1037717 Third Party Advisory VDB Entry
https://github.com/openssl/openssl/commit/efbe126e3ebb9123ac9d058aa2bb044261342aaa Patch Third Party Advisory
https://security.gentoo.org/glsa/201702-07 Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03838en_us Third Party Advisory
https://www.exploit-db.com/exploits/41192/ Exploit Third Party Advisory VDB Entry
https://www.openssl.org/news/secadv/20170126.txt Patch Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html Patch
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