{"schemaVersion":3,"id":"CVE-2021-0205","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"When the \"Intrusion Detection Service\" (IDS) feature is configured on Juniper Networks MX series with a dynamic firewall filter using IPv6 source or destination prefix, it may incorrectly match the prefix as /32, causing the filter to block unexpected traffic. This issue affects only IPv6 prefixes when used as source and destination. This issue affects MX Series devices using MS-MPC, MS-MIC or MS-SPC3 service cards with IDS service configured. This issue affects: Juniper Networks Junos OS 17.3 versions prior to 17.3R3-S10 on MX Series; 17.4 versions prior to 17.4R3-S3 on MX Series; 18.1 versions prior to 18.1R3-S11 on MX Series; 18.2 versions prior to 18.2R3-S6 on MX Series; 18.3 versions prior to 18.3R3-S4 on MX Series; 18.4 versions prior to 18.4R3-S6 on MX Series; 19.1 versions prior to 19.1R2-S2, 19.1R3-S3 on MX Series; 19.2 versions prior to 19.2R3-S1 on MX Series; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1 on MX Series; 19.4 versions prior to 19.4R3 on MX Series; 20.1 versions prior to 20.1R2 on MX Series; 20.2 versions prior to 20.2R2 on MX Series;","dates":{"published":"2021-01-15T17:35:53.539Z","modified":"2024-09-16T17:28:25.455Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.8,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":4.3,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01217,"percentile":0.68197,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.015000000000000083,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01202},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01217,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01217,"percentile":0.68197}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01202,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01202,"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