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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
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
Timeline
- Published
- Nov 11, 2021
- Last modified
- Sep 23, 2026
- NVD status
- Analyzed