BlackTreeCVE Intelligence
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Full vulnerability report · 2017
CVE-2017-3730High confidence

Bad (EC)DHE parameters cause a client crash

OpenSSL · OpenSSL

7.5HighCVSS 3.0
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 16 Sep 2024

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 55.29% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs OpenSSL OpenSSL and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

4 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.0d-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.0d-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.0d-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourceopensslVendor fix publishedDebian records a fixed source-package version for this release.1.1.0d-1Debian Security Tracker ↗Source updated 6 Oct 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2017-12847

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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.

What

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.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

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.

Why

The product dereferences a pointer that it expects to be valid but is NULL.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → NULL Pointer Dereference → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-476 ↗

CWE-476: NULL Pointer Dereference. The product dereferences a pointer that it expects to be valid but is NULL.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-476Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2025-1212Oracle Communications Applications: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Oracle Communications Applications ausnutzen, um dadurch die Integrität, Vertraulichkeit und Verfügbarkeit zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2022-1914OpenSSL: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in OpenSSL ausnutzen, um einen Denial of Service Angriff durchzuführen oder vertrauliche Daten einzusehen.

Official advisory ↗
Canadian Centre for Cyber Security · English · AV18-012Oracle Critical Patch updates

852, CVE-2015-7501, CVE-2015-7547, CVE-2015-7940, CVE-2016-0635, CVE-2016-0703, CVE-2016-0704, CVE-2016-0800, CVE-2016-1181, CVE-2016-1182, CVE-2016-2105, CVE-2016-2106, CVE-2016-2107, CVE-2016-2109, CVE-2016-2177, CVE-2016-2178, CVE-2016-2179, CVE-2016-2180, CVE-2016-2181, CVE-2016-2182, CVE-2016-2183, CVE-2016-2518, CVE-2016-2550, CVE-2016-4449, CVE-2016-5385, CVE-2016-5387, CVE-2016-6302, CVE-2016-6303, CVE-2016-6304, CVE-2016-6305, CVE-2016-6306, CVE-2016-6307, CVE-2016-6308, CVE-2016-6309, CVE-2016-6814, CVE-2016-7052, CVE-2016-7055, CVE-2016-7977, CVE-2016-8735, CVE-2016-9878, CVE-2017-0781, CVE-2017-0782, CVE-2017-0783, CVE-2017-0785, CVE-2017-3730, CVE-2017-3731, CVE-2017-3732, CVE-2017-3733, CVE-2017-3735, CVE-2017-3736, CVE-2017-3737, CVE-2017-3738, CVE-2017-5461, CVE-2017-5645, CVE-2017-5664, CVE-2017-5715, CVE-2017-9072, CVE-2017-9798, CVE-2017-10068, CVE-2017-10262, CVE-2017-10273, CVE-2017-10282, CVE-2017-10301, CVE-2017-10352, CVE-2017-12617, CVE-2017-13077, CVE-2017-13078, CVE-2017-13079, CVE-2017-13080, CVE-2017-13081, CVE-2017-13082, CVE-2018-2560, CVE-2018-2561, CVE-2018-2562, CVE-2018-2564, CVE-2018-2565, CVE-2018-2566, CVE-2018-2567, CVE-2018-2568, CVE-2018-2569, CVE-2018-2570, CVE-2018-2571, CVE-2018-2573, CVE-2018-2574, CVE-2018-2575, CVE-2018-2576, CVE-2018-2577, CVE-2

Official advisory ↗
Canadian Centre for Cyber Security · English · AV17-048Oracle Critical Patch update Advisory – April 2017

581, CVE-2017-3582, CVE-2017-3583, CVE-2017-3584, CVE-2017-3585, CVE-2017-3586, CVE-2017-3587, CVE-2017-3589, CVE-2017-3590, CVE-2017-3591, CVE-2017-3592, CVE-2017-3593, CVE-2017-3594, CVE-2017-3595, CVE-2017-3596, CVE-2017-3597, CVE-2017-3598, CVE-2017-3599, CVE-2017-3600, CVE-2017-3601, CVE-2017-3602, CVE-2017-3603, CVE-2017-3604, CVE-2017-3605, CVE-2017-3606, CVE-2017-3607, CVE-2017-3608, CVE-2017-3609, CVE-2017-3610, CVE-2017-3611, CVE-2017-3612, CVE-2017-3613, CVE-2017-3614, CVE-2017-3615, CVE-2017-3616, CVE-2017-3617, CVE-2017-3618, CVE-2017-3619, CVE-2017-3620, CVE-2017-3621, CVE-2017-3622, CVE-2017-3623, CVE-2017-3625, CVE-2017-3626, CVE-2017-3730, CVE-2017-3731, CVE-2017-3732, CVE-2017-5638 Suggested Action CCIRC recommends that system administrators identify their affected assets and potential interdependencies with their organization’s critical services, and follow their patch management process accordingly. References: http://www.oracle.com/technetwork/security-advisory/cpuapr2017-3236618.html

Official advisory ↗
Canadian Centre for Cyber Security · English · AV17-022Cisco Releases security updates

U glibc Affecting Cisco Products: February 2016 Multiple Vulnerabilities in OpenSSL Affecting Cisco Products: September 2016 Multiple Vulnerabilities in OpenSSL Affecting Cisco Products: January 2017 OSPF LSA Manipulation Vulnerability in Multiple Cisco Products CVE References : Critical Impact CVE: CVE-2017-3823 High Impact CVE: CVE-2015-7547, CVE-2017-3807, CVE-2017-3813 Medium Impact CVE: CVE-2013-0149, CVE-2016-2177, CVE-2016-2178, CVE-2016-2179, CVE-2016-2180, CVE-2016-2181, CVE-2016-2182, CVE-2016-2183, CVE-2016-6302, CVE-2016-6303, CVE-2016-6304, CVE-2016-6305, CVE-2016-6306, CVE-2016-6307, CVE-2016-6308, CVE-2016-6309, CVE-2016-7052, CVE-2017-3730, CVE-2017-3731, CVE-2017-3732 Suggested Action CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly. References: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130801-lsaospf https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160218-glibc https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160927-openssl https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170124-webex https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170

Official advisory ↗
CERT-FR · French · CERTFR-2017-AVI-035Multiples vulnérabilités dans les produits Cisco

De multiples vulnérabilités ont été corrigées dans les produits Cisco . Elles permettent à un attaquant de provoquer un déni de service à distance et une atteinte à la confidentialité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2017-003102OpenSSL におけるサービス運用妨害 (DoS) の脆弱性

OpenSSL には、サービス運用妨害 (NULL ポインタデリファレンスおよびクライアントクラッシュ) 状態にされる脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
OpenSSL: openssl-1.1.0, openssl-1.1.0a, openssl-1.1.0b, openssl-1.1.0c
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 4 May 2017 · Last source change 16 Sept 2024, 17:48 UTC · CWE-476 · NULL Pointer Dereference

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2017-12847
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. ENISA EUVD mappingEUVD-2017-12847 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2017-12847"}
    ENISA EUVD ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added patch: github.com/efbe126e3ebb9123ac9d058aa2bb044261342aaa; added patch: openssl.org/20170126.txt; removed vendor advisory: security.gentoo.org/201702-07; 4 further additions.
    Before
    vendor advisory: security.gentoo.org/201702-07
    After
    patch: github.com/efbe126e3ebb9123ac9d058aa2bb044261342aaa · patch: openssl.org/20170126.txt · patch: oracle.com/cpuapr2019-5072813.html · 3 more references
    oracle.com ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    openssl-1.1.0; openssl-1.1.0a; openssl-1.1.0b; openssl-1.1.0c · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    openssl-1.1.0; openssl-1.1.0a; openssl-1.1.0b; openssl-1.1.0c · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    oracle.com ↗
  5. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    NIST NVD ↗
  6. CVSS scoreCVSS score changed from not recorded to 7.5 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
    Before
    not recorded
    After
    7.5 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
    NIST NVD ↗
  7. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2017-12847↗CVE authority or vendor reference↗Patch or update reference↗Patch or update reference↗Patch or update reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2017-3730 · cve.blacktree.nl