{"id":"CVE-2025-21595","aliases":["EUVD-2025-10527","GHSA-7fvw-hrgg-4cr6"],"status":"published","title":"Junos OS and Junos OS Evolved: In an EVPN-VXLAN scenario specific ARP or NDP packets cause FPC to crash","description":"A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause an FPC to crash, leading to Denial of Service (DoS).\n\nOn all Junos OS and Junos OS Evolved platforms, in an EVPN-VXLAN scenario, when specific ARP packets are received on an IPv4 network, or specific NDP packets are received on an IPv6 network, kernel heap memory leaks, which eventually leads to an FPC crash and restart.\n\nThis issue does not affect MX Series platforms.\nHeap size growth on FPC can be seen using below command.\n\n\nuser@host\u003e show chassis fpc\n                    Temp CPU Utilization (%) CPU Utilization (%) Memory   Utilization (%)\nSlot State           (C) Total Interrupt     1min   5min   15min   DRAM (MB)   Heap   Buffer\n  0 Online           45     3         0       2       2      2       32768      19       0 \u003c\u003c\u003c\u003c\u003c\u003c\u003c Heap increase in all fPCs\n\n\nThis issue affects Junos OS:\n\n  *  All versions before 21.2R3-S7,\n  *  21.4 versions before 21.4R3-S4,\n  *  22.2 versions before 22.2R3-S1, \n  *  22.3 versions before 22.3R3-S1, \n  *  22.4 versions before 22.4R2-S2, 22.4R3.\n\n\nand Junos OS Evolved:\n\n  *  All versions before 21.2R3-S7-EVO,\n  *  21.4-EVO versions before 21.4R3-S4-EVO,\n  *  22.2-EVO versions before 22.2R3-S1-EVO, \n  *  22.3-EVO versions before 22.3R3-S1-EVO, \n\n  *  22.4-EVO versions before 22.4R3-EVO.","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":0.00262,"percentile":0.18082,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-401"],"published":"2025-04-09T19:50:28Z","modified":"2026-06-17T08:43:48Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper","product":"junos_os_evolved"},{"vendor":"juniper networks","product":"junos os"},{"vendor":"juniper networks","product":"junos os evolved"}],"references":[{"url":"https://supportportal.juniper.net/JSA96450","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21595"},{"url":"https://github.com/advisories/GHSA-7fvw-hrgg-4cr6"}],"sources":{"cve":[{"id":"CVE-2025-21595","title":"Junos OS and Junos OS Evolved: In an EVPN-VXLAN scenario specific ARP or NDP packets cause FPC to crash","description":"A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause an FPC to crash, leading to Denial of Service (DoS).\n\nOn all Junos OS and Junos OS Evolved platforms, in an EVPN-VXLAN scenario, when specific ARP packets are received on an IPv4 network, or specific NDP packets are received on an IPv6 network, kernel heap memory leaks, which eventually leads to an FPC crash and restart.\n\nThis issue does not affect MX Series platforms.\nHeap size growth on FPC can be seen using below command.\n\n\nuser@host\u003e show chassis fpc\n                    Temp CPU Utilization (%) CPU Utilization (%) Memory   Utilization (%)\nSlot State           (C) Total Interrupt     1min   5min   15min   DRAM (MB)   Heap   Buffer\n  0 Online           45     3         0       2       2      2       32768      19       0 \u003c\u003c\u003c\u003c\u003c\u003c\u003c Heap increase in all fPCs\n\n\nThis issue affects Junos OS:\n\n  *  All versions before 21.2R3-S7,\n  *  21.4 versions before 21.4R3-S4,\n  *  22.2 versions before 22.2R3-S1, \n  *  22.3 versions before 22.3R3-S1, \n  *  22.4 versions before 22.4R2-S2, 22.4R3.\n\n\nand Junos OS Evolved:\n\n  *  All versions before 21.2R3-S7-EVO,\n  *  21.4-EVO versions before 21.4R3-S4-EVO,\n  *  22.2-EVO versions before 22.2R3-S1-EVO, \n  *  22.3-EVO versions before 22.3R3-S1-EVO, \n\n  *  22.4-EVO versions before 22.4R3-EVO.","status":"published","published":"2025-04-09T19:50:28.091Z","modified":"2025-04-10T13:13:22.128Z","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-401"],"updated_at":"2026-11-02T14:32:32.30152Z"}],"euvd":[{"id":"EUVD-2025-10527","description":"A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause an FPC to crash, leading to Denial of Service (DoS).\n\nOn all Junos OS and Junos OS Evolved platforms, in an EVPN-VXLAN scenario, when specific ARP packets are received on an IPv4 network, or specific NDP packets are received on an IPv6 network, kernel heap memory leaks, which eventually leads to an FPC crash and restart.\n\nThis issue does not affect MX Series platforms.\nHeap size growth on FPC can be seen using below command.\n\n\nuser@host\u003e show chassis fpc\n                    Temp CPU Utilization (%) CPU Utilization (%) Memory   Utilization (%)\nSlot State           (C) Total Interrupt     1min   5min   15min   DRAM (MB)   Heap   Buffer\n  0 Online           45     3         0       2       2      2       32768      19       0 \u003c\u003c\u003c\u003c\u003c\u003c\u003c Heap increase in all fPCs\n\n\nThis issue affects Junos OS:\n\n  *  All versions before 21.2R3-S7,\n  *  21.4 versions before 21.4R3-S4,\n  *  22.2 versions before 22.2R3-S1, \n  *  22.3 versions before 22.3R3-S1, \n  *  22.4 versions before 22.4R2-S2, 22.4R3.\n\n\nand Junos OS Evolved:\n\n  *  All versions before 21.2R3-S7-EVO,\n  *  21.4-EVO versions before 21.4R3-S4-EVO,\n  *  22.2-EVO versions before 22.2R3-S1-EVO, \n  *  22.3-EVO versions before 22.3R3-S1-EVO, \n\n  *  22.4-EVO versions before 22.4R3-EVO.","status":"published","published":"2025-04-09T19:50:28Z","modified":"2025-04-10T13:13:22Z","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":"2026-11-02T20:52:37.204811Z"}],"ghsa":[{"id":"GHSA-7fvw-hrgg-4cr6","title":"A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding...","description":"A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause an FPC to crash, leading to Denial of Service (DoS).\n\nOn all Junos OS and Junos OS Evolved platforms, in an EVPN-VXLAN scenario, when specific ARP packets are received on an IPv4 network, or specific NDP packets are received on an IPv6 network, kernel heap memory leaks, which eventually leads to an FPC crash and restart.\n\nThis issue does not affect MX Series platforms.\nHeap size growth on FPC can be seen using below command.\n\n\nuser@host\u003e show chassis fpc\n                    Temp CPU Utilization (%) CPU Utilization (%) Memory   Utilization (%)\nSlot State           (C) Total Interrupt     1min   5min   15min   DRAM (MB)   Heap   Buffer\n  0 Online           45     3         0       2       2      2       32768      19       0 \u003c\u003c\u003c\u003c\u003c\u003c\u003c Heap increase in all fPCs\n\n\nThis issue affects Junos OS:\n\n  *  All versions before 21.2R3-S7,\n  *  21.4 versions before 21.4R3-S4,\n  *  22.2 versions before 22.2R3-S1, \n  *  22.3 versions before 22.3R3-S1, \n  *  22.4 versions before 22.4R2-S2, 22.4R3.\n\n\nand Junos OS Evolved:\n\n  *  All versions before 21.2R3-S7-EVO,\n  *  21.4-EVO versions before 21.4R3-S4-EVO,\n  *  22.2-EVO versions before 22.2R3-S1-EVO, \n  *  22.3-EVO versions before 22.3R3-S1-EVO, \n\n  *  22.4-EVO versions before 22.4R3-EVO.","status":"published","published":"2025-04-09T21:31:42Z","modified":"2025-04-09T21:31:50Z","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-401"],"updated_at":"2026-11-02T15:01:03.275422Z"}],"nvd":[{"id":"CVE-2025-21595","description":"A Missing Release of Memory after Effective Lifetime vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause an FPC to crash, leading to Denial of Service (DoS).\n\nOn all Junos OS and Junos OS Evolved platforms, in an EVPN-VXLAN scenario, when specific ARP packets are received on an IPv4 network, or specific NDP packets are received on an IPv6 network, kernel heap memory leaks, which eventually leads to an FPC crash and restart.\n\nThis issue does not affect MX Series platforms.\nHeap size growth on FPC can be seen using below command.\n\n\nuser@host\u003e show chassis fpc\n                    Temp CPU Utilization (%) CPU Utilization (%) Memory   Utilization (%)\nSlot State           (C) Total Interrupt     1min   5min   15min   DRAM (MB)   Heap   Buffer\n  0 Online           45     3         0       2       2      2       32768      19       0 \u003c\u003c\u003c\u003c\u003c\u003c\u003c Heap increase in all fPCs\n\n\nThis issue affects Junos OS:\n\n  *  All versions before 21.2R3-S7,\n  *  21.4 versions before 21.4R3-S4,\n  *  22.2 versions before 22.2R3-S1, \n  *  22.3 versions before 22.3R3-S1, \n  *  22.4 versions before 22.4R2-S2, 22.4R3.\n\n\nand Junos OS Evolved:\n\n  *  All versions before 21.2R3-S7-EVO,\n  *  21.4-EVO versions before 21.4R3-S4-EVO,\n  *  22.2-EVO versions before 22.2R3-S1-EVO, \n  *  22.3-EVO versions before 22.3R3-S1-EVO, \n\n  *  22.4-EVO versions before 22.4R3-EVO.","status":"published","published":"2025-04-09T20:15:25.853Z","modified":"2026-06-17T08:43:48.703Z","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-401"],"updated_at":"2026-11-02T14:11:00.087098Z"}]}}