{"cve":"CVE-2023-41378","nvd":{"published":"2023-11-06T16:15:42.273","modified":"2026-06-17T06:22:03.980","status":"Modified","description":"In certain conditions for Calico Typha (v3.26.2, v3.25.1 and below), and Calico Enterprise Typha (v3.17.1, v3.16.3, v3.15.3 and below), a client TLS handshake can block the Calico Typha server indefinitely, resulting in denial of service. The TLS Handshake() call is performed inside the main server handle for loop without any timeout allowing an unclean TLS handshake to block the main loop indefinitely while other connections will be idle waiting for that handshake to finish.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-755","CWE-400","CWE-703"],"references":["https://github.com/projectcalico/calico/pull/7908","https://github.com/projectcalico/calico/pull/7993","https://www.tigera.io/security-bulletins-tta-2023-001/","https://github.com/projectcalico/calico/pull/7908","https://github.com/projectcalico/calico/pull/7993"],"products":["tigera:calico_cloud","tigera:calico_enterprise","tigera:calico_os"],"source":"nvd","synced_at":"2026-10-19T21:40:11.519948003+00:00"},"epss":{"cve":"CVE-2023-41378","score":0.00723,"percentile":0.54035,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-5r5h-q934-cccp","url":"https://osv.dev/vulnerability/GHSA-5r5h-q934-cccp","summary":"Calico Typha denial of service vulnerability","modified":"2026-08-07T08:12:24.008853119Z","packages":[{"ecosystem":"Go","name":"github.com/projectcalico/calico","purl":"pkg:golang/github.com/projectcalico/calico","ranges":[">=3.26.0 <3.26.3"],"fixed":["3.26.3"]},{"ecosystem":"Go","name":"github.com/projectcalico/calico","purl":"pkg:golang/github.com/projectcalico/calico","ranges":["<=3.25.1"],"fixed":[]}]}],"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."]}