{"id":"CVE-2019-0053","details":"Insufficient validation of environment variables in the telnet client supplied in Junos OS can lead to stack-based buffer overflows, which can be exploited to bypass veriexec restrictions on Junos OS. A stack-based overflow is present in the handling of environment variables when connecting via the telnet client to remote telnet servers. This issue only affects the telnet client — accessible from the CLI or shell — in Junos OS. Inbound telnet services are not affected by this issue. This issue affects: Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S13; 12.3X48 versions prior to 12.3X48-D80; 14.1X53 versions prior to 14.1X53-D130, 14.1X53-D49; 15.1 versions prior to 15.1F6-S12, 15.1R7-S4; 15.1X49 versions prior to 15.1X49-D170; 15.1X53 versions prior to 15.1X53-D237, 15.1X53-D496, 15.1X53-D591, 15.1X53-D69; 16.1 versions prior to 16.1R3-S11, 16.1R7-S4; 16.2 versions prior to 16.2R2-S9; 17.1 versions prior to 17.1R3; 17.2 versions prior to 17.2R1-S8, 17.2R2-S7, 17.2R3-S1; 17.3 versions prior to 17.3R3-S4; 17.4 versions prior to 17.4R1-S6, 17.4R2-S3, 17.4R3; 18.1 versions prior to 18.1R2-S4, 18.1R3-S3; 18.2 versions prior to 18.2R1-S5, 18.2R2-S2, 18.2R3; 18.2X75 versions prior to 18.2X75-D40; 18.3 versions prior to 18.3R1-S3, 18.3R2; 18.4 versions prior to 18.4R1-S2, 18.4R2.","modified":"2026-03-15T22:28:51.612919Z","published":"2019-07-11T20:15:11.960Z","references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/10/msg00013.html"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/153746/FreeBSD-Security-Advisory-FreeBSD-SA-19-12.telnet.html"},{"type":"ADVISORY","url":"https://kb.juniper.net/JSA10947"},{"type":"ADVISORY","url":"https://seclists.org/bugtraq/2019/Jul/45"},{"type":"ADVISORY","url":"https://security.FreeBSD.org/advisories/FreeBSD-SA-19:12.telnet.asc"},{"type":"REPORT","url":"https://lists.debian.org/debian-lts-announce/2022/11/msg00033.html"},{"type":"EVIDENCE","url":"https://www.exploit-db.com/exploits/45982"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"12.3-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r1"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r11"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r12"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r13"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r2"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r3"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r4"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r5"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r6"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r7"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r8"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3-r9"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3r12"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d10"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d15"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d25"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d30"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d35"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d40"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d45"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d50"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d55"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d60"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d65"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d70"}]},{"events":[{"introduced":"0"},{"last_affected":"12.3x48-d75"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d10"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d15"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d16"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d25"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d26"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d27"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d30"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d35"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d40"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d45"}]},{"events":[{"introduced":"0"},{"last_affected":"14.1x53-d48"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-a1"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f1"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f2"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f2\\-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f2\\-s2"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f2\\-s3"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f2\\-s4"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f3"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f4"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f5"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f6"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-f6\\-s3"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r1"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r2"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r3"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r4"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r4\\-s9"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r5"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r6"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r6\\-s6"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r7\\-s1"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r7\\-s2"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1-r7\\-s3"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1x49-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1x49-d10"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1x49-d100"}]},{"events":[{"introduced":"0"},{"last_affected":"15.1x49-d110"}]},{"events":[{"introduced":"0"},{"last_affected":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