{"schema_version":"1","data":[{"id":23250,"advisory_id":"da0f0de1-ed71-47f9-95a3-bc07867991ce","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2023-3817","source_published_at":"2023-07-31T15:34:13.627+00:00","published_at":"2026-10-25T06:15:30.023513+00:00","extraction_method":"structured","technologies":["core-cve","openssl"],"cve_ids":["CVE-2023-3817"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"Excessive time spent checking DH q parameter value","summary":"Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH_check(), DH_check_ex() or EVP_PKEY_param_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH_check() performs various checks on DH parameters. After fixing CVE-2023-3446 it was discovered that a large q parameter value can also trigger an overly long computation during some of these checks. A correct q value, if present, cannot be larger than the modulus p parameter, thus it is unnecessary to perform these checks if q is larger than p. An application that calls DH_check() and supplies a key or parameters obtained from an untrusted source could be vulnerable to a Denial of Service attack. The function DH_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH_check_ex() and EVP_PKEY_param_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the \"-check\" option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.","evidence":"cve:CVE-2023-3817","products":[{"name":{"value":"OpenSSL","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"unknown","structured":{"id":"CVE-2023-3817","aliases":["CVE-2023-3817"],"metrics":[{"other":{"type":"https://www.openssl.org/policies/secpolicy.html","content":{"text":"Low"}},"format":"other"}],"affected":[{"vendor":"OpenSSL","product":"OpenSSL","versions":[{"status":"affected","version":"3.1.0","lessThan":"3.1.2","versionType":"semver"},{"status":"affected","version":"3.0.0","lessThan":"3.0.10","versionType":"semver"},{"status":"affected","version":"1.1.1","lessThan":"1.1.1v","versionType":"custom"},{"status":"affected","version":"1.0.2","lessThan":"1.0.2zi","versionType":"custom"}],"defaultStatus":"unaffected"}],"modified":"2026-10-14T21:13:47.977Z","provider":"cve","references":["https://www.openssl.org/news/secadv/20230731.txt","https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5","https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f","https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5","https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644"],"provider_metadata":{"adp":[{"title":"CVE 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PN/DP MFP","versions":[{"status":"affected","version":"V3.1.0","lessThan":"V3.1.5","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.0","lessThan":"V3.1.5","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.0","lessThan":"V3.1.5","versionType":"custom"}],"defaultStatus":"unknown"},{"vendor":"Siemens","product":"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP","versions":[{"status":"affected","version":"V3.1.0","lessThan":"V3.1.5","versionType":"custom"}],"defaultStatus":"unknown"}],"x_adpType":"supplier","references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-099606.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-943925.html"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-915275.html"}],"providerMetadata":{"orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP","dateUpdated":"2026-10-14T21:13:47.977Z"}}],"cna":{"orgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","shortName":"openssl","dateUpdated":"2024-10-14T14:55:48.907Z"}}},"related_cves":[{"value":"CVE-2023-3817","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":null}}],"next_after":23250,"next_before":23250}