{"cve":"CVE-2023-45287","nvd":{"published":"2023-12-05T17:15:08.570","modified":"2026-06-17T06:28:35.460","status":"Modified","description":"Before Go 1.20, the RSA based TLS key exchanges used the math/big library, which is not constant time. RSA blinding was applied to prevent timing attacks, but analysis shows this may not have been fully effective. In particular it appears as if the removal of PKCS#1 padding may leak timing information, which in turn could be used to recover session key bits. In Go 1.20, the crypto/tls library switched to a fully constant time RSA implementation, which we do not believe exhibits any timing side channels.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-203"],"references":["https://go.dev/cl/326012/26","https://go.dev/issue/20654","https://groups.google.com/g/golang-announce/c/QMK8IQALDvA","https://people.redhat.com/~hkario/marvin/","https://pkg.go.dev/vuln/GO-2023-2375"],"products":["golang:go"],"source":"nvd","synced_at":"2026-10-19T21:42:34.585441961+00:00"},"epss":{"cve":"CVE-2023-45287","score":0.0125,"percentile":0.69395,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GO-2023-2375","url":"https://osv.dev/vulnerability/GO-2023-2375","summary":"Before Go 1.20, the RSA based key exchange methods in crypto/tls may exhibit a timing side channel","modified":"2026-02-04T03:57:11.083315Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.20.0"],"fixed":["1.20.0"]}]}],"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."]}