{"id":"CVE-2023-3817","state":"PUBLISHED","title":"Excessive time spent checking DH q parameter value","description":"Issue summary: Checking excessively long DH keys or parameters may be very slow.\n\nImpact summary: Applications that use the functions DH_check(), DH_check_ex()\nor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\ndelays. Where the key or parameters that are being checked have been obtained\nfrom an untrusted source this may lead to a Denial of Service.\n\nThe function DH_check() performs various checks on DH parameters. After fixing\nCVE-2023-3446 it was discovered that a large q parameter value can also trigger\nan overly long computation during some of these checks. A correct q value,\nif present, cannot be larger than the modulus p parameter, thus it is\nunnecessary to perform these checks if q is larger than p.\n\nAn application that calls DH_check() and supplies a key or parameters obtained\nfrom an untrusted source could be vulnerable to a Denial of Service attack.\n\nThe function DH_check() is itself called by a number of other OpenSSL functions.\nAn application calling any of those other functions may similarly be affected.\nThe other functions affected by this are DH_check_ex() and\nEVP_PKEY_param_check().\n\nAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\nwhen using the \"-check\" option.\n\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\n\nThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue.","publishedAt":"2023-07-31T15:34:13.627Z","updatedAt":"2026-10-14T21:13:47.977Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"CISA-ADP"},"assigner":"openssl","products":["OpenSSL OpenSSL"],"affected":[{"vendor":"OpenSSL","product":"OpenSSL","defaultStatus":"unaffected","versions":[{"version":"3.1.0","status":"affected","lessThan":"3.1.2","versionType":"semver"},{"version":"3.0.0","status":"affected","lessThan":"3.0.10","versionType":"semver"},{"version":"1.1.1","status":"affected","lessThan":"1.1.1v","versionType":"custom"},{"version":"1.0.2","status":"affected","lessThan":"1.0.2zi","versionType":"custom"}]}],"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","http://seclists.org/fulldisclosure/2023/Jul/43","http://www.openwall.com/lists/oss-security/2023/07/31/1","https://lists.debian.org/debian-lts-announce/2023/08/msg00019.html","https://security.netapp.com/advisory/ntap-20230818-0014/","http://www.openwall.com/lists/oss-security/2023/09/22/9","http://www.openwall.com/lists/oss-security/2023/09/22/11","https://security.netapp.com/advisory/ntap-20231027-0008/","http://www.openwall.com/lists/oss-security/2023/11/06/2","https://security.gentoo.org/glsa/202402-08","https://security.netapp.com/advisory/ntap-20240621-0006/","https://cert-portal.siemens.com/productcert/html/ssa-099606.html","https://cert-portal.siemens.com/productcert/html/ssa-398330.html","https://cert-portal.siemens.com/productcert/html/ssa-943925.html","https://cert-portal.siemens.com/productcert/html/ssa-915275.html"],"weaknesses":["CWE-606"],"ingestedAt":"2026-10-29T20:06:08.715Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/3xxx/CVE-2023-3817.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-3817","state":"PUBLISHED","datePublished":"2023-07-31T15:34:13.627Z","dateUpdated":"2026-10-14T21:13:47.977Z","assignerShortName":"openssl","assignerOrgId":"3a12439a-ef3a-4c79-92e6-6081a721f1e5","dateReserved":"2023-07-21T08:47:25.638Z"},"containers":{"cna":{"title":"Excessive time spent checking DH q parameter value","descriptions":[{"lang":"en","value":"Issue summary: Checking excessively long DH keys or parameters may be very slow.\n\nImpact summary: Applications that use the functions DH_check(), DH_check_ex()\nor EVP_PKEY_param_check() to check a DH key or DH parameters may experience long\ndelays. Where the key or parameters that are being checked have been obtained\nfrom an untrusted source this may lead to a Denial of Service.\n\nThe function DH_check() performs various checks on DH parameters. After fixing\nCVE-2023-3446 it was discovered that a large q parameter value can also trigger\nan overly long computation during some of these checks. A correct q value,\nif present, cannot be larger than the modulus p parameter, thus it is\nunnecessary to perform these checks if q is larger than p.\n\nAn application that calls DH_check() and supplies a key or parameters obtained\nfrom an untrusted source could be vulnerable to a Denial of Service attack.\n\nThe function DH_check() is itself called by a number of other OpenSSL functions.\nAn application calling any of those other functions may similarly be affected.\nThe other functions affected by this are DH_check_ex() and\nEVP_PKEY_param_check().\n\nAlso vulnerable are the OpenSSL dhparam and pkeyparam command line applications\nwhen using the \"-check\" option.\n\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\n\nThe OpenSSL 3.0 and 3.1 FIPS providers are not affected by this 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