{"cve":"CVE-2015-4000","nvd":{"published":"2015-05-21T00:59:00.087","modified":"2026-06-17T00:26:36.567","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","score":3.7},"cwes":["CWE-310","CWE-295"],"references":["http://aix.software.ibm.com/aix/efixes/security/sendmail_advisory2.asc","http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery","http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc","http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04876402","http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04949778"],"products":["apple:iphone_os","apple:mac_os_x","apple:safari","canonical:ubuntu_linux","debian:debian_linux","google:chrome","hp:hp-ux","ibm:content_manager","microsoft:internet_explorer","mozilla:firefox","mozilla:firefox_esr","mozilla:firefox_os","mozilla:network_security_services","mozilla:seamonkey","mozilla:thunderbird","openssl:openssl","opera:opera_browser","oracle:jdk","oracle:jre","oracle:jrockit","oracle:sparc-opl_service_processor","suse:linux_enterprise_desktop","suse:linux_enterprise_server","suse:linux_enterprise_software_development_kit","suse:suse_linux_enterprise_server"],"source":"nvd","synced_at":"2026-10-19T20:36:40.444340523+00:00"},"epss":{"cve":"CVE-2015-4000","score":0.9986,"percentile":0.99962,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}