{"cve":"CVE-2025-9231","nvd":{"published":"2025-09-30T14:15:41.190","modified":"2026-07-14T13:18:07.550","status":"Deferred","description":"Issue summary: A timing side-channel which could potentially allow remote\nrecovery of the private key exists in the SM2 algorithm implementation on 64 bit\nARM platforms.\n\nImpact summary: A timing side-channel in SM2 signature computations on 64 bit\nARM platforms could allow recovering the private key by an attacker..\n\nWhile remote key recovery over a network was not attempted by the reporter,\ntiming measurements revealed a timing signal which may allow such an attack.\n\nOpenSSL does not directly support certificates with SM2 keys in TLS, and so\nthis CVE is not relevant in most TLS contexts.  However, given that it is\npossible to add support for such certificates via a custom provider, coupled\nwith the fact that in such a custom provider context the private key may be\nrecoverable via remote timing measurements, we consider this to be a Moderate\nseverity issue.\n\nThe FIPS modules in 3.5, 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected by this\nissue, as SM2 is not an approved algorithm.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L","score":6.5},"cwes":["CWE-385"],"references":["https://github.com/openssl/openssl/commit/567f64386e43683888212226824b6a179885a0fe","https://github.com/openssl/openssl/commit/cba616c26ac8e7b37de5e77762e505ba5ca51698","https://github.com/openssl/openssl/commit/eed5adc9f969d77c94f213767acbb41ff923b6f4","https://github.com/openssl/openssl/commit/fc47a2ec078912b3e914fab5734535e76c4820c2","https://openssl-library.org/news/secadv/20250930.txt"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:11:26.888974865+00:00"},"epss":{"cve":"CVE-2025-9231","score":0.02242,"percentile":0.82853,"date":"2026-10-31"},"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."]}