{"cve":"CVE-2016-10027","nvd":{"published":"2017-01-12T23:59:00.197","modified":"2026-06-17T00:38:54.840","status":"Modified","description":"Race condition in the XMPP library in Smack before 4.1.9, when the SecurityMode.required TLS setting has been set, allows man-in-the-middle attackers to bypass TLS protections and trigger use of cleartext for client authentication by stripping the \"starttls\" feature from a server response.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-362"],"references":["http://www.openwall.com/lists/oss-security/2016/12/22/12","http://www.securityfocus.com/bid/95129","https://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22","https://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b","https://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04"],"products":["fedoraproject:fedora","igniterealtime:smack"],"source":"nvd","synced_at":"2026-10-19T20:41:25.729257544+00:00"},"epss":{"cve":"CVE-2016-10027","score":0.01513,"percentile":0.74491,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-66pq-hqv5-228g","url":"https://osv.dev/vulnerability/GHSA-66pq-hqv5-228g","summary":"Smack allows the bypass of TLS protections","modified":"2025-04-21T23:42:10.681981Z","packages":[{"ecosystem":"Maven","name":"org.igniterealtime.smack:smack-core","purl":"pkg:maven/org.igniterealtime.smack/smack-core","ranges":["<4.1.9"],"fixed":["4.1.9"]}]}],"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."]}