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Iteration\nIssue 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.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-3817.json","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-3817.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2023-3817","reference_id":"","reference_type":"","scores":[{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55026","published_at":"2026-04-02T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.54989","published_at":"2026-05-07T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55077","published_at":"2026-04-08T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55076","published_at":"2026-04-09T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55089","published_at":"2026-04-11T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.5507","published_at":"2026-04-12T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.5509","published_at":"2026-04-16T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55094","published_at":"2026-04-18T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55072","published_at":"2026-04-21T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55004","published_at":"2026-04-24T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55024","published_at":"2026-04-26T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.54998","published_at":"2026-04-29T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.54947","published_at":"2026-05-05T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55052","published_at":"2026-04-13T12:55:00Z"},{"value":"0.0032","scoring_system":"epss","scoring_elements":"0.55028","published_at":"2026-04-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2023-3817"},{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3817","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3817"},{"reference_url":"http://seclists.org/fulldisclosure/2023/Jul/43","reference_id":"","reference_type":"","scores":[],"url":"http://seclists.org/fulldisclosure/2023/Jul/43"},{"reference_url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}],"url":"https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml"},{"reference_url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T13:26:20Z/"}],"url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a1eb62c29db6cb5eec707f9338aee00f44e26f5"},{"reference_url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T13:26:20Z/"}],"url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=869ad69aadd985c7b8ca6f4e5dd0eb274c9f3644"},{"reference_url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T13:26:20Z/"}],"url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9002fd07327a91f35ba6c1307e71fa6fd4409b7f"},{"reference_url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5","reference_id":"","reference_type":"","scores":[{"value":"5.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T13:26:20Z/"}],"url":"https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=91ddeba0f2269b017dc06c46c993a788974b1aa5"},{"reference_url":"https://www.openssl.org/news/secadv/20230731.txt","refe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vulnerability in OpenSSL might allow remote attackers to cause a\n    Denial of Service 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