Diffie-Hellman Key Agreement Protocol Public Key algorithmic complexity

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.42

Summaryinfo

A vulnerability classified as problematic was found in Diffie-Hellman Key Agreement Protocol. The impacted element is an unknown function of the component Public Key Handler. Such manipulation leads to algorithmic complexity. This vulnerability is listed as CVE-2002-20001. The attack may be performed from remote. In addition, an exploit is available. Modifying the configuration settings is advised.

Detailsinfo

A vulnerability was found in Diffie-Hellman Key Agreement Protocol (version unknown). It has been rated as problematic. Affected by this issue is an unknown function of the component Public Key Handler. The manipulation with an unknown input leads to a algorithmic complexity vulnerability. Using CWE to declare the problem leads to CWE-407. An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached. Impacted is availability. CVE summarizes:

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.

The weakness was presented 11/12/2021. The advisory is available at github.com. This vulnerability is handled as CVE-2002-20001 since 11/11/2021. Technical details are unknown but a public exploit is available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

The exploit is available at github.com. It is declared as proof-of-concept.

It is possible to mitigate the problem by applying the configuration setting .

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Diffie-Hellman

Name

Key Agreement Protocol

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.7
VulDB Temp Score: 3.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Algorithmic complexity
CWE: CWE-407 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Config
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/11/2021 🔍
11/12/2021 +1 days 🔍
11/12/2021 +0 days 🔍
09/24/2026 +1777 days 🔍

Sourcesinfo

Advisory: 162
Status: Not defined
Confirmation: 🔍

CVE: CVE-2002-20001 (🔍)
GCVE (CVE): GCVE-0-2002-20001
GCVE (VulDB): GCVE-100-186578
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/12/2021 08:35
Updated: 09/24/2026 04:49
Changes: 11/12/2021 08:35 (41), 11/16/2021 10:16 (2), 04/15/2025 16:43 (33), 09/24/2026 04:49 (4)
Complete: 🔍
Cache ID: 216::103