{"cve":"CVE-2002-20001","nvd":{"published":"2021-11-11T19:15:07.380","modified":"2026-09-23T13:10:00.153","status":"Analyzed","description":"The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not public keys, and trigger expensive server-side DHE modular-exponentiation calculations, aka a D(HE)at or D(HE)ater attack. The client needs very little CPU resources and network bandwidth. The attack may be more disruptive in cases where a client can require a server to select its largest supported key size. The basic attack scenario is that the client must claim that it can only communicate with DHE, and the server must be configured to allow DHE.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdf","https://dheatattack.com","https://dheatattack.gitlab.io/","https://github.com/Balasys/dheater","https://github.com/mozilla/ssl-config-generator/issues/162"],"products":["balasys:dheater","f5:big-ip_access_policy_manager","f5:big-ip_advanced_firewall_manager","f5:big-ip_advanced_web_application_firewall","f5:big-ip_analytics","f5:big-ip_application_acceleration_manager","f5:big-ip_application_security_manager","f5:big-ip_application_visibility_and_reporting","f5:big-ip_carrier-grade_nat","f5:big-ip_ddos_hybrid_defender","f5:big-ip_domain_name_system","f5:big-ip_edge_gateway","f5:big-ip_fraud_protection_service","f5:big-ip_global_traffic_manager","f5:big-ip_link_controller","f5:big-ip_local_traffic_manager","f5:big-ip_policy_enforcement_manager","f5:big-ip_service_proxy","f5:big-ip_ssl_orchestrator","f5:big-ip_webaccelerator","f5:big-ip_websafe","f5:big-iq_centralized_management","f5:f5os-a","f5:f5os-c","f5:traffix_signaling_delivery_controller","hpe:arubaos-cx","siemens:scalance_w1750d_firmware","stormshield:stormshield_management_center","stormshield:stormshield_network_security","suse:linux_enterprise_server"],"source":"nvd","synced_at":"2026-10-19T21:24:39.218183596+00:00"},"epss":{"cve":"CVE-2002-20001","score":0.24639,"percentile":0.97888,"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."]}