{"id":"CVE-2021-42074","aliases":["EUVD-2021-29060","GHSA-97hp-rfmm-2c7w"],"status":"published","title":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a...","description":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.","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":"2026-11-12","score":0.01753,"percentile":0.78235,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2021-11-08T03:52:01Z","modified":"2026-10-20T10:54:03Z","products":[{"vendor":"barrier_project","product":"barrier"}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2021/11/02/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","Exploit","Mailing List","Third Party Advisory","evidence"]},{"url":"https://github.com/debauchee/barrier/releases/tag/v2.3.4","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42074"},{"url":"https://github.com/advisories/GHSA-97hp-rfmm-2c7w"}],"sources":{"cve":[{"id":"CVE-2021-42074","description":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.","status":"published","published":"2021-11-08T03:52:01Z","modified":"2024-08-04T03:22:25.99Z","updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29060","description":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.","status":"published","published":"2021-11-08T03:52:01Z","modified":"2024-08-04T03:22:25Z","updated_at":"2026-11-03T03:24:16.784119Z"}],"ghsa":[{"id":"GHSA-97hp-rfmm-2c7w","title":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a...","description":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.","status":"published","published":"2022-05-24T19:20:04Z","modified":"2023-01-30T05:03:50Z","cwes":["CWE-416"],"updated_at":"2026-11-02T14:46:55.198962Z"}],"nvd":[{"id":"CVE-2021-42074","description":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.","status":"published","published":"2021-11-08T04:15:08.547Z","modified":"2026-06-17T04:09:15.963Z","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"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:07:00.984108Z"}],"osv":[{"id":"CVE-2021-42074","description":"An issue was discovered in Barrier before 2.3.4. An unauthenticated attacker can cause a segmentation fault in the barriers component (aka the server-side implementation of Barrier) by quickly opening and closing TCP connections while sending a Hello message for each TCP session.","status":"published","published":"2021-11-08T04:15:08.547Z","modified":"2026-10-20T10:54:03.664148119Z","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"}],"updated_at":"2026-11-02T15:44:21.557945Z"}]}}