{"id":"CVE-2024-21593","aliases":["EUVD-2024-19241","GHSA-chjj-m6f7-j5g6"],"status":"published","title":"Junos OS: MX Series with MPC10, MPC11, LC9600, and MX304: A specific MPLS packet will cause a PFE crash","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific MPLS packet, which upon processing, causes an internal loop, that leads to a PFE crash and restart. Continued receipt of these packets leads to a sustained Denial of Service (DoS) condition.\n \nCircuit cross-connect (CCC) needs to be configured on the device for it to be affected by this issue.\n\nThis issue only affects MX Series with MPC10, MPC11, LC9600, and MX304.\n\nThis issue affects:\nJuniper Networks Junos OS\n21.4 versions from 21.4R3 earlier than 21.4R3-S5;\n22.2 versions from 22.2R2 earlier than 22.2R3-S2;\n22.3 versions from 22.3R1 earlier than 22.3R2-S2;\n22.3 versions from 22.3R3 earlier than 22.3R3-S1\n22.4 versions from 22.4R1 earlier than 22.4R2-S2, 22.4R3;\n23.2 versions earlier than 23.2R1-S1, 23.2R2.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00295,"percentile":0.22392,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-703"],"published":"2024-04-12T14:54:08Z","modified":"2026-06-17T07:09:46Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://supportportal.juniper.net/JSA75732","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","tags":["technical-description","x_transferred","Technical Description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21593"},{"url":"https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"url":"https://github.com/advisories/GHSA-chjj-m6f7-j5g6"}],"sources":{"cve":[{"id":"CVE-2024-21593","title":"Junos OS: MX Series with MPC10, MPC11, LC9600, and MX304: A specific MPLS packet will cause a PFE crash","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific MPLS packet, which upon processing, causes an internal loop, that leads to a PFE crash and restart. Continued receipt of these packets leads to a sustained Denial of Service (DoS) condition.\n \nCircuit cross-connect (CCC) needs to be configured on the device for it to be affected by this issue.\n\nThis issue only affects MX Series with MPC10, MPC11, LC9600, and MX304.\n\nThis issue affects:\nJuniper Networks Junos OS\n21.4 versions from 21.4R3 earlier than 21.4R3-S5;\n22.2 versions from 22.2R2 earlier than 22.2R3-S2;\n22.3 versions from 22.3R1 earlier than 22.3R2-S2;\n22.3 versions from 22.3R3 earlier than 22.3R3-S1\n22.4 versions from 22.4R1 earlier than 22.4R2-S2, 22.4R3;\n23.2 versions earlier than 23.2R1-S1, 23.2R2.","status":"published","published":"2024-04-12T14:54:08.039Z","modified":"2024-08-01T22:27:35.554Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-703"],"updated_at":"2026-11-02T14:34:04.681315Z"}],"euvd":[{"id":"EUVD-2024-19241","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific MPLS packet, which upon processing, causes an internal loop, that leads to a PFE crash and restart. Continued receipt of these packets leads to a sustained Denial of Service (DoS) condition.\n \nCircuit cross-connect (CCC) needs to be configured on the device for it to be affected by this issue.\n\nThis issue only affects MX Series with MPC10, MPC11, LC9600, and MX304.\n\nThis issue affects:\nJuniper Networks Junos OS\n21.4 versions from 21.4R3 earlier than 21.4R3-S5;\n22.2 versions from 22.2R2 earlier than 22.2R3-S2;\n22.3 versions from 22.3R1 earlier than 22.3R2-S2;\n22.3 versions from 22.3R3 earlier than 22.3R3-S1\n22.4 versions from 22.4R1 earlier than 22.4R2-S2, 22.4R3;\n23.2 versions earlier than 23.2R1-S1, 23.2R2.","status":"published","published":"2024-04-12T14:54:08Z","modified":"2024-08-01T22:27:35Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L","level":"high"}],"updated_at":"2026-11-03T03:50:29.983832Z"}],"ghsa":[{"id":"GHSA-chjj-m6f7-j5g6","title":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding...","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific MPLS packet, which upon processing, causes an internal loop, that leads to a PFE crash and restart. Continued receipt of these packets leads to a sustained Denial of Service (DoS) condition.\n \nCircuit cross-connect (CCC) needs to be configured on the device for it to be affected by this issue.\n\nThis issue only affects MX Series with MPC10, MPC11, LC9600, and MX304.\n\nThis issue affects:\nJuniper Networks Junos OS\n21.4 versions from 21.4R3 earlier than 21.4R3-S5;\n22.2 versions from 22.2R2 earlier than 22.2R3-S2;\n22.3 versions from 22.3R1 earlier than 22.3R2-S2;\n22.3 versions from 22.3R3 earlier than 22.3R3-S1\n22.4 versions from 22.4R1 earlier than 22.4R2-S2, 22.4R3;\n23.2 versions earlier than 23.2R1-S1, 23.2R2.","status":"published","published":"2024-04-12T15:37:21Z","modified":"2026-01-23T18:32:26Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-703"],"updated_at":"2026-11-02T15:05:53.055975Z"}],"nvd":[{"id":"CVE-2024-21593","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).\n\nIf an attacker sends a specific MPLS packet, which upon processing, causes an internal loop, that leads to a PFE crash and restart. Continued receipt of these packets leads to a sustained Denial of Service (DoS) condition.\n \nCircuit cross-connect (CCC) needs to be configured on the device for it to be affected by this issue.\n\nThis issue only affects MX Series with MPC10, MPC11, LC9600, and MX304.\n\nThis issue affects:\nJuniper Networks Junos OS\n21.4 versions from 21.4R3 earlier than 21.4R3-S5;\n22.2 versions from 22.2R2 earlier than 22.2R3-S2;\n22.3 versions from 22.3R1 earlier than 22.3R2-S2;\n22.3 versions from 22.3R3 earlier than 22.3R3-S1\n22.4 versions from 22.4R1 earlier than 22.4R2-S2, 22.4R3;\n23.2 versions earlier than 23.2R1-S1, 23.2R2.","status":"published","published":"2024-04-12T15:15:23.187Z","modified":"2026-06-17T07:09:46.953Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-703"],"updated_at":"2026-11-02T14:09:50.299382Z"}]}}