{"id":"CVE-2023-36847","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-36847","generatedAt":"2026-10-31T10:23:18.316Z","title":"Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability","description":"A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity.\n\n\n\n\n\nWith a specific request to installAppPackage.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of \n\nintegrity\n\nfor a certain \n\npart of the file system, which may allow chaining to other vulnerabilities.\n\n\nThis issue affects Juniper Networks Junos OS on EX Series:\n\n\n\n  *  All versions prior to 20.4R3-S8;\n  *  21.1 versions 21.1R1 and later;\n  *  21.2 versions prior to 21.2R3-S6;\n  *  21.3 versions \n\nprior to \n\n 21.3R3-S5;\n  *  21.4 versions \n\nprior to \n\n21.4R3-S4;\n  *  22.1 versions \n\nprior to \n\n22.1R3-S3;\n  *  22.2 versions \n\nprior to \n\n22.2R3-S1;\n  *  22.3 versions \n\nprior to \n\n22.3R2-S2, 22.3R3;\n  *  22.4 versions \n\nprior to \n\n22.4R2-S1, 22.4R3.","published":"2023-08-17T20:15:11.000Z","lastModified":"2026-06-17T06:07:13.000Z","status":"Analyzed","sourceIdentifier":"sirt@juniper.net","cvss":{"version":"3.1","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},"cwe":["CWE-306"],"affected":["juniper/junos"],"epss":{"score":0.83455,"percentile":0.99683,"date":"2026-10-30","history":[{"date":"2026-09-24","score":0.83455,"percentile":0.99676}]},"kev":{"listed":true,"dateAdded":"2023-11-13","dueDate":"2023-11-17","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.\nhttps://supportportal.juniper.net/s/article/2023-08-Out-of-Cycle-Security-Bulletin-Junos-OS-SRX-Series-and-EX-Series-Multiple-vulnerabilities-in-J-Web-can-be-combined-to-allow-a-preAuth-Remote-Code-Execution?language=en_US;  https://nvd.nist.gov/vuln/detail/CVE-2023-36847"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 17 November 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://supportportal.juniper.net/JSA72300","tags":["Vendor Advisory"],"source":"sirt@juniper.net"},{"url":"https://supportportal.juniper.net/JSA72300","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36847","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-36847","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."}