{"cve":"CVE-2024-21598","nvd":{"published":"2024-04-12T15:15:23.377","modified":"2026-06-17T07:09:47.837","status":"Analyzed","description":"An Improper Validation of Syntactic Correctness of Input vulnerability in the Routing Protocol Daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based, unauthenticated attacker to cause a Denial of Service (DoS).\n\nIf a BGP update is received over an established BGP session which contains a tunnel encapsulation attribute with a specifically malformed TLV, rpd will crash and restart.\n\nThis issue affects Juniper Networks\nJunos OS:\n  *  20.4 versions 20.4R1 and later versions earlier than 20.4R3-S9;\n  *  21.2 versions earlier than 21.2R3-S7;\n  *  21.3 versions earlier than 21.3R3-S5;\n  *  21.4 versions earlier than 21.4R3-S5;\n  *  22.1 versions earlier than 22.1R3-S4;\n  *  22.2 versions earlier than 22.2R3-S3;\n  *  22.3 versions earlier than 22.3R3-S1;\n  *  22.4 versions earlier than 22.4R3;\n  *  23.2 versions earlier than 23.2R1-S2, 23.2R2;\n\n\n\nJunos OS Evolved:\n  *  20.4-EVO versions 20.4R1-EVO and later versions earlier than 20.4R3-S9-EVO;\n  *  21.2-EVO versions earlier than 21.2R3-S7-EVO;\n  *  21.3-EVO versions earlier than 21.3R3-S5-EVO;\n  *  21.4-EVO versions earlier than 21.4R3-S5-EVO;\n  *  22.1-EVO versions earlier than 22.1R3-S4-EVO;\n  *  22.2-EVO versions earlier than 22.2R3-S3-EVO;\n  *  22.3-EVO versions earlier than 22.3R3-S1-EVO;\n  *  22.4-EVO versions earlier than 22.4R3-EVO;\n  *  23.2-EVO versions earlier than 23.2R1-S2-EVO, 23.2R2-EVO;\n\n\n\nThis issue does not affect Juniper Networks\n  *  Junos OS versions earlier than 20.4R1;\n  *  Junos OS Evolved versions earlier than 20.4R1-EVO.\n\n\n\nThis is a related but separate issue than the one described in JSA79095.","cvss_v4":{"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","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-1286"],"references":["http://supportportal.juniper.net/JSA75739","https://www.first.org/cvss/calculator/4.0#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","http://supportportal.juniper.net/JSA75739","https://www.first.org/cvss/calculator/4.0#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"],"products":["juniper:junos","juniper:junos_os_evolved"],"source":"nvd","synced_at":"2026-10-19T21:48:32.179249784+00:00"},"epss":{"cve":"CVE-2024-21598","score":0.00571,"percentile":0.4728,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}