Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2002-20001

Severity CVSS v4.0:
Pending analysis
Type:
CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')
Publication date:
11/11/2021
Last modified:
22/08/2025

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.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:balasys:dheater:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_w1750d_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:siemens:scalance_w1750d:-:*:*:*:*:*:*:*
cpe:2.3:o:suse:linux_enterprise_server:11:-:*:*:*:*:*:*
cpe:2.3:o:suse:linux_enterprise_server:12:-:*:*:*:*:*:*
cpe:2.3:o:suse:linux_enterprise_server:15:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* 13.1.0 (including) 16.1.4 (excluding)
cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* 17.0.0 (including) 17.1.0 (excluding)
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:*:*:*:*:*:*:*:* 13.1.0 (including) 17.1.2 (including)
cpe:2.3:a:f5:big-ip_advanced_firewall_manager:17.5.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:* 13.1.0 (including) 17.1.2 (including)
cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:17.5.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_analytics:*:*:*:*:*:*:*:* 13.1.0 (including) 17.1.2 (including)
cpe:2.3:a:f5:big-ip_analytics:17.5.0:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_application_acceleration_manager:*:*:*:*:*:*:*:* 13.1.0 (including) 17.1.2 (including)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools