{
  "affected": [
    {
      "database_specific": {
        "unresolved_ranges": [
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "25"
              }
            ]
          }
        ]
      },
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "4.1.9"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "af6e80deccb7f587c8339272e4a7e8449edb7fdf"
            },
            {
              "fixed": "059ee99ba0d5ff7758829acf5a9aeede09ec820b"
            },
            {
              "fixed": "a9d5cd4a611f47123f9561bc5a81a4555fe7cb04"
            }
          ],
          "repo": "https://github.com/igniterealtime/smack",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "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.",
  "id": "CVE-2016-10027",
  "modified": "2026-04-01T23:07:47.680356185Z",
  "published": "2017-01-12T23:59:00.197Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J4WXAZ4JVJXHMEDDXJVWJHPVBF5QCTZF/"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.securityfocus.com/bid/95129"
    },
    {
      "type": "ADVISORY",
      "url": "https://community.igniterealtime.org/blogs/ignite/2016/11/22/smack-security-advisory-2016-11-22"
    },
    {
      "type": "REPORT",
      "url": "https://issues.igniterealtime.org/projects/SMACK/issues/SMACK-739"
    },
    {
      "type": "FIX",
      "url": "http://www.openwall.com/lists/oss-security/2016/12/22/12"
    },
    {
      "type": "FIX",
      "url": "https://github.com/igniterealtime/Smack/commit/059ee99ba0d5ff7758829acf5a9aeede09ec820b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/igniterealtime/Smack/commit/a9d5cd4a611f47123f9561bc5a81a4555fe7cb04"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}