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Fencer Vulns
high 7.5

CVE-2002-20001 in the critical feed json

The Diffie-Hellman Key Agreement Protocol allows remote attackers (from the client side) to send arbitrary numbers that are actually not pu…

published 2021-11-11 4 y ago modified 2026-09-23 46 d ago also EUVD-2002-1979

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
24.6%
EPSS 24.6% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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.

Patch / fix

  • f5 big-ip_access_policy_manager 16.1.4, 17.1.0
  • stormshield stormshield_management_center 3.3.3
  • stormshield stormshield_network_security 4.3.16, 4.6.3
  • hpe arubaos-cx 10.06.0180, 10.07.0030, 10.08.0010, 10.09.0002
  • openssl-1_1 openSUSE Tumbleweed 1.1.1m-4.1
  • ssh-audit openSUSE Tumbleweed 3.2.0-1.1

opensuse advisories openSUSE-SU-2024:11905-1openSUSE-SU-2024:13932-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-22-314-10 updated cvss 7.5

Siemens SCALANCE W1750D

  • Siemens SCALANCE W1750D (JP) (6GK5750-2HX01-1AD0) <V8.7.1.11 Siemens SCALANCE W1750D (ROW) (6GK5750-2HX01-1AA0) <V8.7.1.11 Siemens SCALANCE W1750D (USA) (6GK5750-2HX01-1AB0) <V8.7.1.11
    affected: fixed in V8.7.1.11 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

24.64% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • researchgate.net https://www.researchgate.net/profile/Anton-Stiglic-2/publication/2401745_Security_Issues_in_the_Diffie-Hellman_Key_Agreement_Protocol referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.