{"id":"CVE-2025-21601","aliases":["EUVD-2025-10526","GHSA-95f3-h98w-ww8w"],"status":"published","title":"Junos OS: SRX and EX Series, MX240, MX480, MX960, QFX5120 Series: When web management is enabled for specific services an attacker may cause a CPU spike by sending genuine packets to the device","description":"An Improper Following of Specification by Caller vulnerability in web management (J-Web, Captive Portal, 802.1X, Juniper Secure Connect (JSC) of Juniper Networks Junos OS on SRX Series, EX Series, MX240, MX480, MX960, QFX5120 Series, allows an unauthenticated, network-based attacker, sending genuine traffic targeted to the device to cause the CPU to climb until the device becomes unresponsive. \n\nContinuous receipt of these packets will create a sustained Denial of Service (DoS) condition.\n\n\n\n\nThis issue affects Junos OS: \n\n\n\n  *  All versions before 21.4R3-S9,\n  *  from 22.2 before 22.2R3-S5,\n  *  from 22.4 before 22.4R3-S4,\n  *  from 23.2 before 23.2R2-S3,\n  *  from 23.4 before 23.4R2-S3,\n  *  from 24.2 before 24.2R1-S1, 24.2R2.\n\n\nAn indicator of compromise is to review the CPU % of the httpd process in the CLI:\ne.g.\n  show system processes extensive | match httpd  PID nobody       52    0    20M    191M select   2   0:01   80.00% httpd{httpd} \u003c\u003c\u003c\u003c\u003c the percentage of httpd usage if high may be an indicator","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00433,"percentile":0.37997,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-573"],"published":"2025-04-09T19:51:36Z","modified":"2026-06-17T08:43:49Z","products":[{"vendor":"juniper","product":"junos"},{"vendor":"juniper networks","product":"junos os"}],"references":[{"url":"https://supportportal.juniper.net/JSA96452","tags":["vendor-advisory","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21601"},{"url":"https://github.com/advisories/GHSA-95f3-h98w-ww8w"}],"sources":{"cve":[{"id":"CVE-2025-21601","title":"Junos OS: SRX and EX Series, MX240, MX480, MX960, QFX5120 Series: When web management is enabled for specific services an attacker may cause a CPU spike by sending genuine packets to the device","description":"An Improper Following of Specification by Caller vulnerability in web management (J-Web, Captive Portal, 802.1X, Juniper Secure Connect (JSC) of Juniper Networks Junos OS on SRX Series, EX Series, MX240, MX480, MX960, QFX5120 Series, allows an unauthenticated, network-based attacker, sending genuine traffic targeted to the device to cause the CPU to climb until the device becomes unresponsive. \n\nContinuous receipt of these packets will create a sustained Denial of Service (DoS) condition.\n\n\n\n\nThis issue affects Junos OS: \n\n\n\n  *  All versions before 21.4R3-S9,\n  *  from 22.2 before 22.2R3-S5,\n  *  from 22.4 before 22.4R3-S4,\n  *  from 23.2 before 23.2R2-S3,\n  *  from 23.4 before 23.4R2-S3,\n  *  from 24.2 before 24.2R1-S1, 24.2R2.\n\n\nAn indicator of compromise is to review the CPU % of the httpd process in the CLI:\ne.g.\n  show system processes extensive | match httpd  PID nobody       52    0    20M    191M select   2   0:01   80.00% httpd{httpd} \u003c\u003c\u003c\u003c\u003c the percentage of httpd usage if high may be an indicator","status":"published","published":"2025-04-09T19:51:36.325Z","modified":"2025-04-15T20:30:05.134Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber","level":"high","assessor":"cna"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-573"],"updated_at":"2026-11-02T14:32:32.30152Z"}],"euvd":[{"id":"EUVD-2025-10526","description":"An Improper Following of Specification by Caller vulnerability in web management (J-Web, Captive Portal, 802.1X, Juniper Secure Connect (JSC) of Juniper Networks Junos OS on SRX Series, EX Series, MX240, MX480, MX960, QFX5120 Series, allows an unauthenticated, network-based attacker, sending genuine traffic targeted to the device to cause the CPU to climb until the device becomes unresponsive. \n\nContinuous receipt of these packets will create a sustained Denial of Service (DoS) condition.\n\n\n\n\nThis issue affects Junos OS: \n\n\n\n  *  All versions before 21.4R3-S9,\n  *  from 22.2 before 22.2R3-S5,\n  *  from 22.4 before 22.4R3-S4,\n  *  from 23.2 before 23.2R2-S3,\n  *  from 23.4 before 23.4R2-S3,\n  *  from 24.2 before 24.2R1-S1, 24.2R2.\n\n\nAn indicator of compromise is to review the CPU % of the httpd process in the CLI:\ne.g.\n  show system processes extensive | match httpd  PID nobody       52    0    20M    191M select   2   0:01   80.00% httpd{httpd} \u003c\u003c\u003c\u003c\u003c the percentage of httpd usage if high may be an indicator","status":"published","published":"2025-04-09T19:51:36Z","modified":"2025-04-15T20:30:05Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber","level":"high"}],"updated_at":"2026-11-02T20:52:25.86191Z"}],"ghsa":[{"id":"GHSA-95f3-h98w-ww8w","title":"An Improper Following of Specification by Caller vulnerability in web management (J-Web, Captive...","description":"An Improper Following of Specification by Caller vulnerability in web management (J-Web, Captive Portal, 802.1X, Juniper Secure Connect (JSC) of Juniper Networks Junos OS on SRX Series, EX Series, MX240, MX480, MX960, QFX5120 Series, allows an unauthenticated, network-based attacker, sending genuine traffic targeted to the device to cause the CPU to climb until the device becomes unresponsive. \n\nContinuous receipt of these packets will create a sustained Denial of Service (DoS) condition.\n\n\n\n\nThis issue affects Junos OS: \n\n\n\n  *  All versions before 21.4R3-S9,\n  *  from 22.2 before 22.2R3-S5,\n  *  from 22.4 before 22.4R3-S4,\n  *  from 23.2 before 23.2R2-S3,\n  *  from 23.4 before 23.4R2-S3,\n  *  from 24.2 before 24.2R1-S1, 24.2R2.\n\n\nAn indicator of compromise is to review the CPU % of the httpd process in the CLI:\ne.g.\n  show system processes extensive | match httpd  PID nobody       52    0    20M    191M select   2   0:01   80.00% httpd{httpd} \u003c\u003c\u003c\u003c\u003c the percentage of httpd usage if high may be an indicator","status":"published","published":"2025-04-09T21:31:43Z","modified":"2025-04-15T21:32:36Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/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:Y/R:A/V:C/RE:M/U:Amber","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-573"],"updated_at":"2026-11-02T15:01:33.833824Z"}],"nvd":[{"id":"CVE-2025-21601","description":"An Improper Following of Specification by Caller vulnerability in web management (J-Web, Captive Portal, 802.1X, Juniper Secure Connect (JSC) of Juniper Networks Junos OS on SRX Series, EX Series, MX240, MX480, MX960, QFX5120 Series, allows an unauthenticated, network-based attacker, sending genuine traffic targeted to the device to cause the CPU to climb until the device becomes unresponsive. \n\nContinuous receipt of these packets will create a sustained Denial of Service (DoS) condition.\n\n\n\n\nThis issue affects Junos OS: \n\n\n\n  *  All versions before 21.4R3-S9,\n  *  from 22.2 before 22.2R3-S5,\n  *  from 22.4 before 22.4R3-S4,\n  *  from 23.2 before 23.2R2-S3,\n  *  from 23.4 before 23.4R2-S3,\n  *  from 24.2 before 24.2R1-S1, 24.2R2.\n\n\nAn indicator of compromise is to review the CPU % of the httpd process in the CLI:\ne.g.\n  show system processes extensive | match httpd  PID nobody       52    0    20M    191M select   2   0:01   80.00% httpd{httpd} \u003c\u003c\u003c\u003c\u003c the percentage of httpd usage if high may be an indicator","status":"published","published":"2025-04-09T20:15:26.35Z","modified":"2026-06-17T08:43:49.797Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/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:Y/R:A/V:C/RE:M/U:Amber","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-573"],"updated_at":"2026-11-02T14:11:00.087098Z"}]}}