{"id":"CVE-2024-39557","aliases":["EUVD-2024-38083","GHSA-g26w-g327-7xm5"],"status":"published","title":"Junos OS Evolved: MAC table changes cause a memory leak","description":"An Uncontrolled Resource Consumption vulnerability in the \n\nLayer 2 Address Learning Daemon (l2ald)\n\n of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a memory leak, eventually exhausting all system memory, leading to a system crash and Denial of Service (DoS).\n\nCertain MAC table updates cause a small amount of memory to leak.  Once memory utilization reaches its limit, the issue will result in a system crash and restart.\n\nTo identify the issue, execute the CLI command:\n \nuser@device\u003e show platform application-info allocations app l2ald-agent\nEVL Object Allocation Statistics:\n \n Node    Application       Context   Name                                 Live     Allocs     Fails       Guids\n re0     l2ald-agent                 net::juniper::rtnh::L2Rtinfo         1069096  1069302    0           1069302\n re0     l2ald-agent                 net::juniper::rtnh::NHOpaqueTlv       114      195        0           195\n\n\n\nThis issue affects Junos OS Evolved: \n\n\n  *  All versions before 21.4R3-S8-EVO,\n\n  *  from 22.2-EVO before 22.2R3-S4-EVO, \n  *  from 22.3-EVO before 22.3R3-S3-EVO, \n  *  from 22.4-EVO before 22.4R3-EVO, \n  *  from 23.2-EVO before 23.2R2-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/R:A","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00246,"percentile":0.15972,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2024-07-10T22:39:48Z","modified":"2026-06-17T07:42:13Z","products":[{"vendor":"juniper","product":"junos_os_evolved"},{"vendor":"juniper networks","product":"junos os evolved"}],"references":[{"url":"https://supportportal.juniper.net/JSA83017","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-39557"},{"url":"https://github.com/advisories/GHSA-g26w-g327-7xm5"}],"sources":{"cve":[{"id":"CVE-2024-39557","title":"Junos OS Evolved: MAC table changes cause a memory leak","description":"An Uncontrolled Resource Consumption vulnerability in the \n\nLayer 2 Address Learning Daemon (l2ald)\n\n of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a memory leak, eventually exhausting all system memory, leading to a system crash and Denial of Service (DoS).\n\nCertain MAC table updates cause a small amount of memory to leak.  Once memory utilization reaches its limit, the issue will result in a system crash and restart.\n\nTo identify the issue, execute the CLI command:\n \nuser@device\u003e show platform application-info allocations app l2ald-agent\nEVL Object Allocation Statistics:\n \n Node    Application       Context   Name                                 Live     Allocs     Fails       Guids\n re0     l2ald-agent                 net::juniper::rtnh::L2Rtinfo         1069096  1069302    0           1069302\n re0     l2ald-agent                 net::juniper::rtnh::NHOpaqueTlv       114      195        0           195\n\n\n\nThis issue affects Junos OS Evolved: \n\n\n  *  All versions before 21.4R3-S8-EVO,\n\n  *  from 22.2-EVO before 22.2R3-S4-EVO, \n  *  from 22.3-EVO before 22.3R3-S3-EVO, \n  *  from 22.4-EVO before 22.4R3-EVO, \n  *  from 23.2-EVO before 23.2R2-EVO.","status":"published","published":"2024-07-10T22:39:48.575Z","modified":"2024-08-02T04:26:15.916Z","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/R:A","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-400"],"updated_at":"2026-11-02T14:34:19.28149Z"}],"euvd":[{"id":"EUVD-2024-38083","description":"An Uncontrolled Resource Consumption vulnerability in the \n\nLayer 2 Address Learning Daemon (l2ald)\n\n of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a memory leak, eventually exhausting all system memory, leading to a system crash and Denial of Service (DoS).\n\nCertain MAC table updates cause a small amount of memory to leak.  Once memory utilization reaches its limit, the issue will result in a system crash and restart.\n\nTo identify the issue, execute the CLI command:\n \nuser@device\u003e show platform application-info allocations app l2ald-agent\nEVL Object Allocation Statistics:\n \n Node    Application       Context   Name                                 Live     Allocs     Fails       Guids\n re0     l2ald-agent                 net::juniper::rtnh::L2Rtinfo         1069096  1069302    0           1069302\n re0     l2ald-agent                 net::juniper::rtnh::NHOpaqueTlv       114      195        0           195\n\n\n\nThis issue affects Junos OS Evolved: \n\n\n  *  All versions before 21.4R3-S8-EVO,\n\n  *  from 22.2-EVO before 22.2R3-S4-EVO, \n  *  from 22.3-EVO before 22.3R3-S3-EVO, \n  *  from 22.4-EVO before 22.4R3-EVO, \n  *  from 23.2-EVO before 23.2R2-EVO.","status":"published","published":"2024-07-10T22:39:48Z","modified":"2024-08-02T04:26:15Z","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/R:A","level":"high"}],"updated_at":"2026-11-03T03:50:18.019857Z"}],"ghsa":[{"id":"GHSA-g26w-g327-7xm5","title":"An Uncontrolled Resource Consumption vulnerability in the \n\nLayer 2 Address Learning Daemon ...","description":"An Uncontrolled Resource Consumption vulnerability in the \n\nLayer 2 Address Learning Daemon (l2ald)\n\n of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a memory leak, eventually exhausting all system memory, leading to a system crash and Denial of Service (DoS).\n\nCertain MAC table updates cause a small amount of memory to leak.  Once memory utilization reaches its limit, the issue will result in a system crash and restart.\n\nTo identify the issue, execute the CLI command:\n \nuser@device\u003e show platform application-info allocations app l2ald-agent\nEVL Object Allocation Statistics:\n \n Node    Application       Context   Name                                 Live     Allocs     Fails       Guids\n re0     l2ald-agent                 net::juniper::rtnh::L2Rtinfo         1069096  1069302    0           1069302\n re0     l2ald-agent                 net::juniper::rtnh::NHOpaqueTlv       114      195        0           195\n\n\n\nThis issue affects Junos OS Evolved: \n\n\n  *  All versions before 21.4R3-S8-EVO,\n\n  *  from 22.2-EVO before 22.2R3-S4-EVO, \n  *  from 22.3-EVO before 22.3R3-S3-EVO, \n  *  from 22.4-EVO before 22.4R3-EVO, \n  *  from 23.2-EVO before 23.2R2-EVO.","status":"published","published":"2024-07-11T00:32:51Z","modified":"2024-08-09T05:01:47Z","cvss":[{"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"},{"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:A/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:57:54.57979Z"}],"nvd":[{"id":"CVE-2024-39557","description":"An Uncontrolled Resource Consumption vulnerability in the \n\nLayer 2 Address Learning Daemon (l2ald)\n\n of Juniper Networks Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a memory leak, eventually exhausting all system memory, leading to a system crash and Denial of Service (DoS).\n\nCertain MAC table updates cause a small amount of memory to leak.  Once memory utilization reaches its limit, the issue will result in a system crash and restart.\n\nTo identify the issue, execute the CLI command:\n \nuser@device\u003e show platform application-info allocations app l2ald-agent\nEVL Object Allocation Statistics:\n \n Node    Application       Context   Name                                 Live     Allocs     Fails       Guids\n re0     l2ald-agent                 net::juniper::rtnh::L2Rtinfo         1069096  1069302    0           1069302\n re0     l2ald-agent                 net::juniper::rtnh::NHOpaqueTlv       114      195        0           195\n\n\n\nThis issue affects Junos OS Evolved: \n\n\n  *  All versions before 21.4R3-S8-EVO,\n\n  *  from 22.2-EVO before 22.2R3-S4-EVO, \n  *  from 22.3-EVO before 22.3R3-S3-EVO, \n  *  from 22.4-EVO before 22.4R3-EVO, \n  *  from 23.2-EVO before 23.2R2-EVO.","status":"published","published":"2024-07-10T23:15:12.37Z","modified":"2026-06-17T07:42:13.377Z","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:A/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-400"],"updated_at":"2026-11-02T14:10:12.016585Z"}]}}