What’s Vulnerable › Vulnerabilities

CVE-2024-41996

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-26 · updated 2026-10-15
• Weakness: CWE-295

Description

Validating the order of the public keys in the Diffie-Hellman Key Agreement Protocol, when an approved safe prime is used, allows remote attackers (from the client side) to trigger unnecessarily expensive server-side DHE modular-exponentiation calculations. The client may cause asymmetric resource consumption. 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 and validate the order of the public key.

Affected products

• Diffie-Hellman Key Exchange Project Diffie-Hellman Key Exchange: all versions

References

• https://dheatattack.gitlab.io/details/
• https://dheatattack.gitlab.io/faq/
• https://gist.github.com/c0r0n3r/abccc14d4d96c0442f3a77fa5ca255d1
• https://cert-portal.siemens.com/productcert/html/ssa-089022.html
• https://cert-portal.siemens.com/productcert/html/ssa-265688.html
• https://cert-portal.siemens.com/productcert/html/ssa-485750.html

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