Is CVE-2015-4000 actively exploited?

CVE-2015-4000 has no public evidence of in-the-wild exploitation as of 2025-04-12.

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

CVE-2015-4000 has a CVSS score of 3.7 (LOW severity). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

How do I patch CVE-2015-4000?

Patch guidance is available from openssl security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2015-4000.

CVE-2015-4000 - remediation guidance & executive summary

Q: Which products are affected by CVE-2015-4000?

42 products: openssl openssl, openssl openssl, canonical ubuntu linux, canonical ubuntu linux, canonical ubuntu linux, and 37 more.

Description

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.

CVSS Metrics

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector: network
Complexity: high
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-310

Metadata

Primary Vendor: OPENSSL
Published: 5/21/2015
Last Modified: 4/12/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

openssl : opensslopenssl : opensslcanonical : ubuntu_linuxcanonical : ubuntu_linuxcanonical : ubuntu_linuxcanonical : ubuntu_linuxopenssl : opensslhp : hp-uxibm : content_manageroracle : jrockitdebian : debian_linuxdebian : debian_linuxoracle : jdkoracle : jdkoracle : jdkoracle : jdkoracle : jdkoracle : jreoracle : jreoracle : jreoracle : jreoracle : jresuse : linux_enterprise_desktopsuse : linux_enterprise_serversuse : linux_enterprise_software_development_kitsuse : suse_linux_enterprise_serverapple : iphone_osapple : mac_os_xmozilla : network_security_servicesoracle : sparc-opl_service_processorapple : safarigoogle : chromemicrosoft : internet_explorermozilla : firefoxopera : opera_browsermozilla : firefoxmozilla : firefoxmozilla : firefox_esrmozilla : seamonkeymozilla : thunderbirdmozilla : thunderbirdmozilla : firefox_os

Remediation Guidance

Executive Summary

View on NIST NVD