Is CVE-2002-20001 being actively exploited?

CVE-2002-20001 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2002-20001?

CVE-2002-20001 has a CVSS 3.1 base score of 7.5 (HIGH).

CVE-2002-20001

HIGH · CVSS 7.5EPSS 24.6%EU EUVD

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.

Key facts

CVSS score: 7.5 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
EPSS score: 24.6% (98th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2002-1979)
Published: November 11, 2021
NVD last modified: September 23, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2002-1979 in the EU Vulnerability Database. Last updated in EUVD on February 13, 2025.

View on the EU Vulnerability Database

Affected products

balasys / dheater
f5 / big-ip access policy manager
f5 / big-ip advanced firewall manager
f5 / big-ip advanced firewall manager
f5 / big-ip advanced web application firewall
f5 / big-ip advanced web application firewall
f5 / big-ip analytics
f5 / big-ip analytics
f5 / big-ip application acceleration manager
f5 / big-ip application acceleration manager
f5 / big-ip application security manager
f5 / big-ip application security manager
f5 / big-ip application visibility and reporting
f5 / big-ip application visibility and reporting
f5 / big-ip carrier-grade nat
f5 / big-ip carrier-grade nat
f5 / big-ip ddos hybrid defender
f5 / big-ip ddos hybrid defender
f5 / big-ip domain name system
f5 / big-ip domain name system
f5 / big-ip edge gateway
f5 / big-ip edge gateway
f5 / big-ip fraud protection service
f5 / big-ip fraud protection service
f5 / big-ip global traffic manager
f5 / big-ip global traffic manager
f5 / big-ip link controller
f5 / big-ip link controller
f5 / big-ip local traffic manager
f5 / big-ip local traffic manager
f5 / big-ip policy enforcement manager
f5 / big-ip policy enforcement manager
f5 / big-ip service proxy
f5 / big-ip ssl orchestrator
f5 / big-ip ssl orchestrator
f5 / big-ip webaccelerator
f5 / big-ip webaccelerator
f5 / big-ip websafe
f5 / big-ip websafe
f5 / big-iq centralized management
f5 / big-iq centralized management
f5 / f5os-a
f5 / f5os-a
f5 / f5os-c
f5 / f5os-c
f5 / f5os-c
f5 / f5os-c
f5 / f5os-c
f5 / traffix signaling delivery controller
f5 / traffix signaling delivery controller

and 26 more…

Certified products that may be affected

7 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

SUSE Linux Enterprise Server 15, SP4 - SUSE Software Solutions Germany GmbH - Common Criteria BSI-DSZ-CC-1248-2026 - active
SUSE Linux Enterprise Server, Version 15 SP4 - SUSE LLC - Common Criteria BSI-DSZ-CC-1231-2026 - active
F5OS-A Cryptographic Module - F5, Inc. - FIPS 140 4883 - active
SUSE Linux Enterprise Server 15 SP4 - SUSE LLC - Common Criteria BSI-DSZ-CC-1213-2023 - active
SUSE Linux Enterprise Server Version 15 SP2 - SUSE LLC - Common Criteria BSI-DSZ-CC-1168-2021 - active

See all 7 in the Security Certifications Explorer.

References

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)

Last updated September 25, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain