CVE-2002-20001

Exp

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: 2021-11-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2002-20001 is rated High Exploit Risk (83.5/100): CVSS High severity, with high exploitation likelihood (EPSS 23.06%, 97th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +4.35% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2002-20001

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2002-20001

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 18.72% 23.06% +4.35%
2 2026-06-07 14.68% 18.72% +4.04%
3 2026-03-04 — 14.68% —

Full EPSS history (74 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2002-20001

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2002-20001

OS Trackers for CVE-2002-20001

vendor priority summary link
suse high CVE-2002-20001 severity important: SUSE including 50 source package names (libopenssl-1_1-devel, libopenssl-1_1-devel-1.1.1l-150400.5.14, …), 108 product×package rows across 47 product lines (SUSE CaaS Platform 4.0, SUSE CaaS Platform 4.5, … (47 product lines)): Known Not Affected 64, Fixed 44. https://www.suse.com/security/cve/CVE-2002-20001/

Affected software / configurations for CVE-2002-20001

Vendor Product Version Raw CPE
balasys dheater — cpe:2.3:a:balasys:dheater:-:*:*:*:*:*:*:*
siemens scalance_w1750d_firmware — cpe:2.3:o:siemens:scalance_w1750d_firmware:*:*:*:*:*:*:*:*
suse linux_enterprise_server 11 cpe:2.3:o:suse:linux_enterprise_server:11:-:*:*:*:*:*:*
suse linux_enterprise_server 12 cpe:2.3:o:suse:linux_enterprise_server:12:-:*:*:*:*:*:*
suse linux_enterprise_server 15 cpe:2.3:o:suse:linux_enterprise_server:15:*:*:*:*:*:*:*
f5 big-ip_access_policy_manager >= 13.1.0, < 16.1.4 cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_access_policy_manager >= 17.0.0, < 17.1.0 cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_firewall_manager >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:*
f5 big-ip_advanced_firewall_manager 17.5.0 cpe:2.3:a:f5:big-ip_advanced_firewall_manager:17.5.0:*:*:*:*:*:*:*
f5 big-ip_advanced_web_application_firewall >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*
f5 big-ip_advanced_web_application_firewall 17.5.0 cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:17.5.0:*:*:*:*:*:*:*
f5 big-ip_analytics >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:*
f5 big-ip_analytics 17.5.0 cpe:2.3:a:f5:big-ip_analytics:17.5.0:*:*:*:*:*:*:*
f5 big-ip_application_acceleration_manager >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_acceleration_manager 17.5.0 cpe:2.3:a:f5:big-ip_application_acceleration_manager:17.5.0:*:*:*:*:*:*:*
f5 big-ip_application_security_manager >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*
f5 big-ip_application_security_manager 17.5.0 cpe:2.3:a:f5:big-ip_application_security_manager:17.5.0:*:*:*:*:*:*:*
f5 big-ip_application_visibility_and_reporting >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:*:*:*:*:*:*:*:*
f5 big-ip_application_visibility_and_reporting 17.5.0 cpe:2.3:a:f5:big-ip_application_visibility_and_reporting:17.5.0:*:*:*:*:*:*:*
f5 big-ip_carrier-grade_nat >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_carrier-grade_nat:*:*:*:*:*:*:*:*
f5 big-ip_carrier-grade_nat 17.5.0 cpe:2.3:a:f5:big-ip_carrier-grade_nat:17.5.0:*:*:*:*:*:*:*
f5 big-ip_ddos_hybrid_defender >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:*:*:*:*:*:*:*:*
f5 big-ip_ddos_hybrid_defender 17.5.0 cpe:2.3:a:f5:big-ip_ddos_hybrid_defender:17.5.0:*:*:*:*:*:*:*
f5 big-ip_domain_name_system >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:*
f5 big-ip_domain_name_system 17.5.0 cpe:2.3:a:f5:big-ip_domain_name_system:17.5.0:*:*:*:*:*:*:*
f5 big-ip_edge_gateway >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_edge_gateway:*:*:*:*:*:*:*:*
f5 big-ip_edge_gateway 17.5.0 cpe:2.3:a:f5:big-ip_edge_gateway:17.5.0:*:*:*:*:*:*:*
f5 big-ip_fraud_protection_service >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_fraud_protection_service:*:*:*:*:*:*:*:*
f5 big-ip_fraud_protection_service 17.5.0 cpe:2.3:a:f5:big-ip_fraud_protection_service:17.5.0:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_global_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_global_traffic_manager 17.5.0 cpe:2.3:a:f5:big-ip_global_traffic_manager:17.5.0:*:*:*:*:*:*:*
f5 big-ip_link_controller >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_link_controller:*:*:*:*:*:*:*:*
f5 big-ip_link_controller 17.5.0 cpe:2.3:a:f5:big-ip_link_controller:17.5.0:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
f5 big-ip_local_traffic_manager 17.5.0 cpe:2.3:a:f5:big-ip_local_traffic_manager:17.5.0:*:*:*:*:*:*:*
f5 big-ip_policy_enforcement_manager >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_policy_enforcement_manager:*:*:*:*:*:*:*:*
f5 big-ip_policy_enforcement_manager 17.5.0 cpe:2.3:a:f5:big-ip_policy_enforcement_manager:17.5.0:*:*:*:*:*:*:*
f5 big-ip_service_proxy 1.6.0 cpe:2.3:a:f5:big-ip_service_proxy:1.6.0:*:*:*:*:kubernetes:*:*
f5 big-ip_ssl_orchestrator >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_ssl_orchestrator:*:*:*:*:*:*:*:*
f5 big-ip_ssl_orchestrator 17.5.0 cpe:2.3:a:f5:big-ip_ssl_orchestrator:17.5.0:*:*:*:*:*:*:*
f5 big-ip_webaccelerator >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_webaccelerator:*:*:*:*:*:*:*:*
f5 big-ip_webaccelerator 17.5.0 cpe:2.3:a:f5:big-ip_webaccelerator:17.5.0:*:*:*:*:*:*:*
f5 big-ip_websafe >= 13.1.0, <= 17.1.2 cpe:2.3:a:f5:big-ip_websafe:*:*:*:*:*:*:*:*
f5 big-ip_websafe 17.5.0 cpe:2.3:a:f5:big-ip_websafe:17.5.0:*:*:*:*:*:*:*
f5 big-iq_centralized_management >= 8.0.0, <= 8.4.0 cpe:2.3:a:f5:big-iq_centralized_management:*:*:*:*:*:*:*:*
f5 big-iq_centralized_management 7.1.0 cpe:2.3:a:f5:big-iq_centralized_management:7.1.0:*:*:*:*:*:*:*
f5 traffix_signaling_delivery_controller 5.1.0 cpe:2.3:a:f5:traffix_signaling_delivery_controller:5.1.0:*:*:*:*:*:*:*
f5 traffix_signaling_delivery_controller 5.2.0 cpe:2.3:a:f5:traffix_signaling_delivery_controller:5.2.0:*:*:*:*:*:*:*
f5 f5os-a >= 1.3.0, <= 1.3.2 cpe:2.3:o:f5:f5os-a:*:*:*:*:*:*:*:*
f5 f5os-a >= 1.5.0, <= 1.5.3 cpe:2.3:o:f5:f5os-a:*:*:*:*:*:*:*:*
f5 f5os-a 1.8.0 cpe:2.3:o:f5:f5os-a:1.8.0:*:*:*:*:*:*:*
f5 f5os-c >= 1.3.0, <= 1.3.2 cpe:2.3:o:f5:f5os-c:*:*:*:*:*:*:*:*
f5 f5os-c >= 1.6.0, <= 1.6.2 cpe:2.3:o:f5:f5os-c:*:*:*:*:*:*:*:*
f5 f5os-c 1.5.0 cpe:2.3:o:f5:f5os-c:1.5.0:*:*:*:*:*:*:*
f5 f5os-c 1.5.1 cpe:2.3:o:f5:f5os-c:1.5.1:*:*:*:*:*:*:*
f5 f5os-c 1.8.0 cpe:2.3:o:f5:f5os-c:1.8.0:*:*:*:*:*:*:*
f5 f5os-c 1.8.1 cpe:2.3:o:f5:f5os-c:1.8.1:*:*:*:*:*:*:*
hpe arubaos-cx >= 10.06.0000, < 10.06.0180 cpe:2.3:o:hpe:arubaos-cx:*:*:*:*:*:*:*:*
hpe arubaos-cx >= 10.07.0000, < 10.07.0030 cpe:2.3:o:hpe:arubaos-cx:*:*:*:*:*:*:*:*
hpe arubaos-cx >= 10.08.0000, < 10.08.0010 cpe:2.3:o:hpe:arubaos-cx:*:*:*:*:*:*:*:*
hpe arubaos-cx >= 10.09.0000, < 10.09.0002 cpe:2.3:o:hpe:arubaos-cx:*:*:*:*:*:*:*:*
stormshield stormshield_management_center < 3.3.3 cpe:2.3:a:stormshield:stormshield_management_center:*:*:*:*:*:*:*:*
stormshield stormshield_network_security >= 2.7.0, < 4.3.16 cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:*
stormshield stormshield_network_security >= 4.4.0, < 4.6.3 cpe:2.3:a:stormshield:stormshield_network_security:*:*:*:*:*:*:*:*

References for CVE-2002-20001

URL Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdf Third Party Advisory
https://dheatattack.com Third Party Advisory
https://dheatattack.gitlab.io/ Third Party Advisory
https://github.com/Balasys/dheater Product Third Party Advisory
https://github.com/mozilla/ssl-config-generator/issues/162 Issue Tracking
https://gitlab.com/dheatattack/dheater Third Party Advisory
https://ieeexplore.ieee.org/document/10374117 Technical Description Third Party Advisory
https://support.f5.com/csp/article/K83120834 Third Party Advisory
https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txt Technical Description Third Party Advisory
https://www.openssl.org/blog/blog/2022/10/21/tls-groups-configuration/ Third Party Advisory
https://www.reddit.com/r/netsec/comments/qdoosy/server_overload_by_enforcing_dhe_key_exchange/ Issue Tracking
https://www.researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol Exploit Technical Description
https://www.suse.com/support/kb/doc/?id=000020510 Third Party Advisory
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