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CVE-2022-40735 is a denial-of-service weakness in Diffie-Hellman key agreement implementations that permit unnecessarily long private exponents during DHE operations. The issue arises because the protocol can be implemented with oversized exponents even though appropriately short exponents are sufficient when proper subgroup constraints are enforced. Allowing long exponents increases the cost of modular exponentiation on the server side and can make key exchange calculations disproportionately expensive. In affected implementations and protocols such as TLS, SSH, or IKE, a remote peer can trigger repeated expensive DHE computations and drive excessive CPU consumption. The issue is distinct from CVE-2002-20001 in that it concerns exponent size selection rather than invalid public-key values, although both issues can be combined to worsen computational load.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL Diffie-Hellman oversized-exponent CPU exhaustion vulnerability referenced as a structural analogue to the primary issue.
A vulnerability referenced in the context of DH performance and resource-consumption risk, highlighting the need to limit private key sizes for Diffie-Hellman operations.
A denial-of-service vulnerability referenced in the context of earlier-than-TLS-1.3 Diffie-Hellman parameter generation issues.
A denial-of-service related vulnerability in Diffie-Hellman key exchange implementations where use of long private exponents can make modular exponentiation unnecessarily expensive, increasing resource consumption.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.