CVE-2002-20001
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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 24.6%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 24.64% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- balasys/dheater · siemens/scalance w1750d firmware · suse/linux enterprise server · f5/big-ip access policy manager · f5/big-ip advanced firewall manager · f5/big-ip advanced web application firewall · f5/big-ip analytics · f5/big-ip application acceleration manager · f5/big-ip application security manager · f5/big-ip application visibility and reporting · f5/big-ip carrier-grade nat · f5/big-ip ddos hybrid defender · f5/big-ip domain name system · f5/big-ip edge gateway · f5/big-ip fraud protection service · f5/big-ip global traffic manager · f5/big-ip link controller · f5/big-ip local traffic manager · f5/big-ip policy enforcement manager · f5/big-ip service proxy · +10 more
- Source
- cve@mitre.org
EPSS 24.6% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdfThird Party Advisory
- https://dheatattack.comThird Party Advisory
- https://dheatattack.gitlab.io/Third Party Advisory
- https://github.com/Balasys/dheaterProduct, Third Party Advisory
- https://github.com/mozilla/ssl-config-generator/issues/162Issue Tracking
- https://gitlab.com/dheatattack/dheaterThird Party Advisory
- https://ieeexplore.ieee.org/document/10374117Technical Description, Third Party Advisory
- https://support.f5.com/csp/article/K83120834Third Party Advisory
- https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txtTechnical 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_ProtocolExploit, Technical Description
- https://www.suse.com/support/kb/doc/?id=000020510Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-506569.pdfThird Party Advisory
- https://dheatattack.comThird Party Advisory
- https://dheatattack.gitlab.io/Third Party Advisory
- https://github.com/Balasys/dheaterProduct, Third Party Advisory
- https://github.com/mozilla/ssl-config-generator/issues/162Issue Tracking
- https://gitlab.com/dheatattack/dheaterThird Party Advisory
- https://ieeexplore.ieee.org/document/10374117Technical Description, Third Party Advisory
- https://support.f5.com/csp/article/K83120834Third Party Advisory
- https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2022-004.txtTechnical 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_ProtocolExploit, Technical Description
- https://www.suse.com/support/kb/doc/?id=000020510Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.