{"cve_id":"CVE-2015-4000","published":"2015-05-21T00:59:00.087000+00:00","last_modified":"2026-06-17T00:26:36.567000+00:00","vuln_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_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","base_score":3.7,"base_severity":"LOW","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"NONE","impact_i":"LOW","impact_a":"NONE","cwe_ids":["CWE-310","CWE-295"],"in_kev":false,"kev_date_added":null,"kev_ransomware":false,"epss_score":0.9986,"epss_percentile":0.99962,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["AUTH_BYPASS","TAMPER"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T08:22:24.828806+00:00","first_seen":"2015-05-21T00:59:00.087000+00:00","kev_first_seen":null,"novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["apple","canonical","debian","google","hp","ibm","microsoft","mozilla","openssl","opera","oracle","suse"],"products":["chrome","content_manager","debian_linux","firefox","firefox_esr","firefox_os","hp-ux","internet_explorer","iphone_os","jdk","jre","jrockit","linux_enterprise_desktop","linux_enterprise_server","linux_enterprise_software_development_kit","mac_os_x","network_security_services","openssl","opera_browser","safari","seamonkey","sparc-opl_service_processor","suse_linux_enterprise_server","thunderbird","ubuntu_linux"],"affected":[{"vendor":"apple","product":"iphone_os","ranges":["≤ 8.3"]},{"vendor":"apple","product":"mac_os_x","ranges":["≤ 10.10.3"]},{"vendor":"apple","product":"safari","ranges":["all versions"]},{"vendor":"canonical","product":"ubuntu_linux","ranges":["14.10","15.04","12.04","14.04"]},{"vendor":"debian","product":"debian_linux","ranges":["7.0","8.0"]},{"vendor":"google","product":"chrome","ranges":["all versions"]},{"vendor":"hp","product":"hp-ux","ranges":["b.11.31"]},{"vendor":"ibm","product":"content_manager","ranges":["8.5"]},{"vendor":"microsoft","product":"internet_explorer","ranges":["all versions"]},{"vendor":"mozilla","product":"firefox","ranges":["38.1.0","39.0","all versions"]},{"vendor":"mozilla","product":"firefox_esr","ranges":["31.8"]},{"vendor":"mozilla","product":"firefox_os","ranges":["2.2"]},{"vendor":"mozilla","product":"network_security_services","ranges":["3.19"]},{"vendor":"mozilla","product":"seamonkey","ranges":["2.35"]},{"vendor":"mozilla","product":"thunderbird","ranges":["31.8","38.1"]},{"vendor":"openssl","product":"openssl","ranges":["≥ 1.0.1 and ≤ 1.0.1m","≥ 1.0.2 and ≤ 1.0.2a","≤ 1.0.1m"]},{"vendor":"opera","product":"opera_browser","ranges":["all versions"]},{"vendor":"oracle","product":"jdk","ranges":["1.6.0","1.7.0","1.8.0"]},{"vendor":"oracle","product":"jre","ranges":["1.6.0","1.7.0","1.8.0"]},{"vendor":"oracle","product":"jrockit","ranges":["r28.3.6"]},{"vendor":"oracle","product":"sparc-opl_service_processor","ranges":["≤ 1121"]},{"vendor":"suse","product":"linux_enterprise_desktop","ranges":["12"]},{"vendor":"suse","product":"linux_enterprise_server","ranges":["11.0"]},{"vendor":"suse","product":"linux_enterprise_software_development_kit","ranges":["12"]},{"vendor":"suse","product":"suse_linux_enterprise_server","ranges":["12"]}]}