What is the CVSS score of CVE-2015-4000?

CVE-2015-4000 has a CVSS 3.1 base score of 3.7 (Low). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N. EPSS exploitation probability: 93.7%.

Is there a public PoC exploit available for CVE-2015-4000?

Yes, a public proof-of-concept exploit is available for CVE-2015-4000. Prioritise patching immediately. EPSS: 93.7%.

Is there a patch available for CVE-2015-4000?

Yes, a patch is available for CVE-2015-4000. Update the affected software to the latest version immediately.

OpenSSL CVE-2015-4000

LOW

Cryptographic Issues (CWE-310)

2015-05-21 cve@mitre.org

Information Disclosure Google OpenSSL IBM Apple Microsoft Debian Oracle Mozilla HP Canonical Debian Linux Iphone Os Jdk Jre Linux Enterprise Desktop Linux Enterprise Server Linux Enterprise Software Development Kit Seamonkey Thunderbird Ubuntu Linux Firefox Esr Suse Hp Ux Mac Os X Opera Opera Browser Network Security Services Suse Linux Enterprise Server Firefox Os Jrockit Content Manager Sparc Opl Service Processor

3.7

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-310 OWASP Top 10:2025 A04:2025 - Cryptographic Failures ASVS 5.0 V11 - Cryptography Cryptographic controls
Impact	CVSS score of 3.7 (LOW). Attack characteristics: network attack vector, high complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. EPSS exploitation probability: 93.74%.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the low-severity affected system.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).

Patch available 93.7% exploitation probability (EPSS)

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AnalysisAI

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to. Rated low severity (CVSS 3.7), this vulnerability is remotely exploitable, no authentication required. Public exploit code available and EPSS exploitation probability 93.7%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-310. The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue. Affected products include: Openssl, Canonical Ubuntu Linux, Hp Hp-Ux, Ibm Content Manager, Oracle Jrockit.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 3.7 LOW

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

DescriptionCVE.org

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

Threat Intelligence Overview

Threat Score

5.1/10

Composite threat intelligence

EPSS Score

93.7%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

Citrix

NVD

CVE.org

EPSS POC (1)

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity LOW

CISA KEV No

Public POC Yes

EPSS 93.7%

Patch available Yes

Active threat Yes

Deciding rule

LOW severity (CVSS 0.1-3.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Low

Priority Score

132

Low Medium High Critical

KEV: 0

EPSS: +94

CVSS: +18

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:14.10:*:*:*:*:*:*:*

cpe:2.3:o:canonical:ubuntu_linux:15.04:*:*:*:*:*:*:*

cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

cpe:2.3:o:hp:hp-ux:b.11.31:*:*:*:*:*:*:*

cpe:2.3:a:ibm:content_manager:8.5:*:*:*:*:enterprise:*:*

cpe:2.3:a:oracle:jrockit:r28.3.6:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*

cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

cpe:2.3:a:oracle:jdk:1.6.0:update95:*:*:*:*:*:*

cpe:2.3:a:oracle:jdk:1.7.0:update75:*:*:*:*:*:*

cpe:2.3:a:oracle:jdk:1.7.0:update80:*:*:*:*:*:*

cpe:2.3:a:oracle:jdk:1.8.0:update_33:*:*:*:*:*:*

cpe:2.3:a:oracle:jdk:1.8.0:update45:*:*:*:*:*:*

cpe:2.3:a:oracle:jre:1.6.0:update_95:*:*:*:*:*:*

cpe:2.3:a:oracle:jre:1.7.0:update_75:*:*:*:*:*:*

cpe:2.3:a:oracle:jre:1.7.0:update_80:*:*:*:*:*:*

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