{"id":"CVE-2024-21591","url":"https://www.cyber-defence.io/tools/cve/CVE-2024-21591","generatedAt":"2026-11-04T22:34:53.415Z","title":"An Out-of-bounds Write vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS), or Remote Code Execution (RCE) and obtain root privileges on the…","description":"\nAn Out-of-bounds Write vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS), or Remote Code Execution (RCE) and obtain root privileges on the device.\n\nThis issue is caused by use of an insecure function allowing an attacker to overwrite arbitrary memory.\n\nThis issue affects Juniper Networks Junos OS SRX Series and EX Series:\n\n\n\n  *  Junos OS versions earlier than 20.4R3-S9;\n  *  Junos OS 21.2 versions earlier than 21.2R3-S7;\n  *  Junos OS 21.3 versions earlier than 21.3R3-S5;\n  *  Junos OS 21.4 versions earlier than 21.4R3-S5;\n  *  Junos OS 22.1 versions earlier than 22.1R3-S4;\n  *  Junos OS 22.2 versions earlier than 22.2R3-S3;\n  *  Junos OS 22.3 versions earlier than 22.3R3-S2;\n  *  Junos OS 22.4 versions earlier than 22.4R2-S2, 22.4R3.\n\n\n\n\n\n\n","published":"2024-01-12T01:15:47.000Z","lastModified":"2026-06-17T07:09:47.000Z","status":"Analyzed","sourceIdentifier":"sirt@juniper.net","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-787"],"affected":["juniper/junos"],"epss":{"score":0.17668,"percentile":0.97158,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 17.7%, higher than 97% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://curesec.com/blog/article/CVE-2024-21591_Juniper_Remote_Code_Exec.html","tags":["Exploit","Third Party Advisory"],"source":"sirt@juniper.net"},{"url":"https://supportportal.juniper.net/JSA75729","tags":["Vendor Advisory"],"source":"sirt@juniper.net"},{"url":"https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","tags":["Third Party Advisory"],"source":"sirt@juniper.net"},{"url":"https://curesec.com/blog/article/CVE-2024-21591_Juniper_Remote_Code_Exec.html","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://supportportal.juniper.net/JSA75729","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-21591","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}