{"cve":"CVE-2023-6237","nvd":{"published":"2024-04-25T07:15:45.270","modified":"2026-10-14T23:17:19.220","status":"Deferred","description":"Issue summary: Checking excessively long invalid RSA public keys may take\na long time.\n\nImpact summary: Applications that use the function EVP_PKEY_public_check()\nto check RSA public keys may experience long delays. Where the key that\nis being checked has been obtained from an untrusted source this may lead\nto a Denial of Service.\n\nWhen function EVP_PKEY_public_check() is called on RSA public keys,\na computation is done to confirm that the RSA modulus, n, is composite.\nFor valid RSA keys, n is a product of two or more large primes and this\ncomputation completes quickly. However, if n is an overly large prime,\nthen this computation would take a long time.\n\nAn application that calls EVP_PKEY_public_check() and supplies an RSA key\nobtained from an untrusted source could be vulnerable to a Denial of Service\nattack.\n\nThe function EVP_PKEY_public_check() is not called from other OpenSSL\nfunctions however it is called from the OpenSSL pkey command line\napplication. For that reason that application is also vulnerable if used\nwith the '-pubin' and '-check' options on untrusted data.\n\nThe OpenSSL SSL/TLS implementation is not affected by this issue.\n\nThe OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-606"],"references":["https://github.com/openssl/openssl/commit/0b0f7abfb37350794a4b8960fafc292cd5d1b84d","https://github.com/openssl/openssl/commit/18c02492138d1eb8b6548cb26e7b625fb2414a2a","https://github.com/openssl/openssl/commit/a830f551557d3d66a84bbb18a5b889c640c36294","https://www.openssl.org/news/secadv/20240115.txt","http://www.openwall.com/lists/oss-security/2024/03/11/1"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:49:08.435428910+00:00"},"epss":{"cve":"CVE-2023-6237","score":0.02303,"percentile":0.83204,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}