{"cve":"CVE-2023-1732","nvd":{"published":"2023-05-10T12:15:10.523","modified":"2026-06-17T05:28:38.170","status":"Modified","description":"When sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read() returns an error. In rare deployment cases (error thrown by the Read() function), this could lead to a predictable shared secret.\n\nThe tkn20 and blindrsa components did not check whether enough randomness was returned from the user provided randomness source. Typically the user provides crypto/rand.Reader, which in the vast majority of cases will always return the right number random bytes. In the cases where it does not, or the user provides a source that does not, the blinding for blindrsa is weak and integrity of the plaintext is not ensured in tkn20.","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:H/A:N","score":8.2},"cwes":["CWE-755","CWE-20"],"references":["https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x","https://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x"],"products":["cloudflare:circl"],"source":"nvd","synced_at":"2026-10-19T21:38:18.424950729+00:00"},"epss":{"cve":"CVE-2023-1732","score":0.00386,"percentile":0.32707,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2q89-485c-9j2x","url":"https://osv.dev/vulnerability/GHSA-2q89-485c-9j2x","summary":"Improper random reading in CIRCL","modified":"2026-09-10T03:49:54.418293155Z","packages":[{"ecosystem":"Go","name":"github.com/cloudflare/circl","purl":"pkg:golang/github.com/cloudflare/circl","ranges":["<1.3.3"],"fixed":["1.3.3"]}]},{"id":"GO-2023-1765","url":"https://osv.dev/vulnerability/GO-2023-1765","summary":"Leaked shared secret and weak blinding in github.com/cloudflare/circl","modified":"2026-02-04T02:22:58.839282Z","packages":[{"ecosystem":"Go","name":"github.com/cloudflare/circl","purl":"pkg:golang/github.com/cloudflare/circl","ranges":["<1.3.3"],"fixed":["1.3.3"]}]}],"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."]}