{"id":"CVE-2023-24609","aliases":["EUVD-2023-28624","GHSA-75jg-c8f9-x2rh"],"status":"published","title":"Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow...","description":"Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hello Pre-Shared Key extension parsing in the TLS 1.3 server. An attacked device calculates an SHA-2 hash over at least 65 KB (in RAM). With a large number of crafted TLS messages, the CPU becomes heavily loaded. This occurs in tls13VerifyBinder and tls13TranscriptHashUpdate.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00731,"percentile":0.54612,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-190"],"published":"2023-12-22T00:00:00Z","modified":"2026-06-17T05:39:39Z","products":[{"vendor":"matrixssl","product":"matrixssl"},{"vendor":"rambus","product":"tls_toolkit"}],"references":[{"url":"https://www.telekom.com/en/company/data-privacy-and-security/news/advisories-504842","tags":["x_transferred","Exploit","Third Party Advisory"]},{"url":"https://www.rambus.com/security/software-protocols/tls-toolkit/","tags":["x_transferred","Product"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-24609"},{"url":"https://github.com/advisories/GHSA-75jg-c8f9-x2rh"}],"sources":{"cve":[{"id":"CVE-2023-24609","description":"Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hello Pre-Shared Key extension parsing in the TLS 1.3 server. An attacked device calculates an SHA-2 hash over at least 65 KB (in RAM). With a large number of crafted TLS messages, the CPU becomes heavily loaded. This occurs in tls13VerifyBinder and tls13TranscriptHashUpdate.","status":"published","published":"2023-12-22T00:00:00Z","modified":"2024-08-02T11:03:18.963Z","updated_at":"2026-11-02T14:35:27.006218Z"}],"euvd":[{"id":"EUVD-2023-28624","description":"Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hello Pre-Shared Key extension parsing in the TLS 1.3 server. An attacked device calculates an SHA-2 hash over at least 65 KB (in RAM). With a large number of crafted TLS messages, the CPU becomes heavily loaded. This occurs in tls13VerifyBinder and tls13TranscriptHashUpdate.","status":"published","published":"2023-12-22T00:00:00Z","modified":"2024-08-02T11:03:18Z","updated_at":"2026-11-03T03:50:07.32318Z"}],"ghsa":[{"id":"GHSA-75jg-c8f9-x2rh","title":"Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow...","description":"Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hello Pre-Shared Key extension parsing in the TLS 1.3 server. An attacked device calculates an SHA-2 hash over at least 65 KB (in RAM). With a large number of crafted TLS messages, the CPU becomes heavily loaded. This occurs in tls13VerifyBinder and tls13TranscriptHashUpdate.","status":"published","published":"2023-12-22T06:30:26Z","modified":"2024-01-12T05:08:52Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:55:24.003446Z"}],"nvd":[{"id":"CVE-2023-24609","description":"Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hello Pre-Shared Key extension parsing in the TLS 1.3 server. An attacked device calculates an SHA-2 hash over at least 65 KB (in RAM). With a large number of crafted TLS messages, the CPU becomes heavily loaded. This occurs in tls13VerifyBinder and tls13TranscriptHashUpdate.","status":"published","published":"2023-12-22T04:15:08.673Z","modified":"2026-06-17T05:39:39.093Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:08:57.117371Z"}]}}