Vulnerability Database

328,409

Total vulnerabilities in the database

CVE-2002-20001

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.

  • Published: Nov 11, 2021
  • Updated: Nov 9, 2025
  • CVE: CVE-2002-20001
  • Severity: High
  • Exploit:

CVSS v3:

  • Severity: High
  • Score: 7.5
  • AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2:

  • Severity: Medium
  • Score: 5
  • AV:N/AC:L/Au:N/C:N/I:N/A:P

CWEs:

Software From Fixed in
siemens / scalance_w1750d_firmware - -
suse / linux_enterprise_server 15 15.x
suse / linux_enterprise_server 11 11.x
suse / linux_enterprise_server 12 12.x
f5 / big-iq_centralized_management 7.1.0 7.1.0.x
f5 / big-ip_service_proxy 1.6.0 1.6.0.x
f5 / f5os-c 1.5.1 1.5.1.x
f5 / f5os-c 1.5.0 1.5.0.x
f5 / f5os-c 1.3.0 1.3.2.x
hpe / arubaos-cx 10.06.0000 10.06.0180
hpe / arubaos-cx 10.07.0000 10.07.0030
hpe / arubaos-cx 10.08.0000 10.08.0010
hpe / arubaos-cx 10.09.0000 10.09.0002
stormshield / stormshield_network_security 4.4.0 4.6.3
stormshield / stormshield_management_center - 3.3.3
stormshield / stormshield_network_security 2.7.0 4.3.16
f5 / traffix_signaling_delivery_controller 5.2.0 5.2.0.x
f5 / traffix_signaling_delivery_controller 5.1.0 5.1.0.x
f5 / big-ip_access_policy_manager 13.1.0 16.1.4
f5 / big-ip_access_policy_manager 17.0.0 17.1.0
f5 / big-ip_advanced_firewall_manager 13.1.0 17.1.2.x
f5 / big-ip_advanced_firewall_manager 17.5.0 17.5.0.x
f5 / big-ip_advanced_web_application_firewall 13.1.0 17.1.2.x
f5 / big-ip_advanced_web_application_firewall 17.5.0 17.5.0.x
f5 / big-ip_analytics 13.1.0 17.1.2.x
f5 / big-ip_analytics 17.5.0 17.5.0.x
f5 / big-ip_application_acceleration_manager 13.1.0 17.1.2.x
f5 / big-ip_application_acceleration_manager 17.5.0 17.5.0.x
f5 / big-ip_application_security_manager 13.1.0 17.1.2.x
f5 / big-ip_application_security_manager 17.5.0 17.5.0.x
f5 / big-ip_application_visibility_and_reporting 13.1.0 17.1.2.x
f5 / big-ip_application_visibility_and_reporting 17.5.0 17.5.0.x
f5 / big-ip_carrier-grade_nat 13.1.0 17.1.2.x
f5 / big-ip_carrier-grade_nat 17.5.0 17.5.0.x
f5 / big-ip_ddos_hybrid_defender 13.1.0 17.1.2.x
f5 / big-ip_ddos_hybrid_defender 17.5.0 17.5.0.x
f5 / big-ip_domain_name_system 13.1.0 17.1.2.x
f5 / big-ip_domain_name_system 17.5.0 17.5.0.x
f5 / big-ip_edge_gateway 13.1.0 17.1.2.x
f5 / big-ip_edge_gateway 17.5.0 17.5.0.x
f5 / big-ip_fraud_protection_service 13.1.0 17.1.2.x
f5 / big-ip_fraud_protection_service 17.5.0 17.5.0.x
f5 / big-ip_global_traffic_manager 13.1.0 17.1.2.x
f5 / big-ip_global_traffic_manager 17.5.0 17.5.0.x
f5 / big-ip_link_controller 13.1.0 17.1.2.x
f5 / big-ip_link_controller 17.5.0 17.5.0.x
f5 / big-ip_local_traffic_manager 13.1.0 17.1.2.x
f5 / big-ip_local_traffic_manager 17.5.0 17.5.0.x
f5 / big-ip_policy_enforcement_manager 13.1.0 17.1.2.x
f5 / big-ip_policy_enforcement_manager 17.5.0 17.5.0.x
f5 / big-ip_ssl_orchestrator 13.1.0 17.1.2.x
f5 / big-ip_ssl_orchestrator 17.5.0 17.5.0.x
f5 / big-ip_webaccelerator 13.1.0 17.1.2.x
f5 / big-ip_webaccelerator 17.5.0 17.5.0.x
f5 / big-ip_websafe 13.1.0 17.1.2.x
f5 / big-ip_websafe 17.5.0 17.5.0.x
f5 / big-iq_centralized_management 8.0.0 8.4.0.x
f5 / f5os-a 1.3.0 1.3.2.x
f5 / f5os-a 1.5.0 1.5.3.x
f5 / f5os-a 1.8.0 1.8.0.x
f5 / f5os-c 1.6.0 1.6.2.x
f5 / f5os-c 1.8.0 1.8.0.x
f5 / f5os-c 1.8.1 1.8.1.x

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.