{"cve":"CVE-2023-44203","nvd":{"published":"2023-10-13T00:15:12.987","modified":"2026-06-17T06:27:07.263","status":"Modified","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600 allows a adjacent attacker to send specific traffic, which leads to packet flooding, resulting in a Denial of Service (DoS).\n\nWhen a specific IGMP packet is received in an isolated VLAN, it is duplicated to all other ports under the primary VLAN, which causes a flood.\n\nThis issue affects QFX5000 series, EX2300, EX3400, EX4100, EX4400 and EX4600 platforms only.\n\nThis issue affects Juniper Junos OS on on QFX5000 Series, EX2300, EX3400, EX4100, EX4400 and EX4600:\n\n\n\n  *  All versions prior to 20.4R3-S5;\n  *  21.1 versions prior to 21.1R3-S4;\n  *  21.2 versions prior to 21.2R3-S3;\n  *  21.3 versions prior to 21.3R3-S5;\n  *  21.4 versions prior to 21.4R3-S2;\n  *  22.1 versions prior to 22.1R3;\n  *  22.2 versions prior to 22.2R3;\n  *  22.3 versions prior to 22.3R2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-703"],"references":["https://supportportal.juniper.net/JSA73169","https://supportportal.juniper.net/JSA73169"],"products":["juniper:junos"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-44203","score":0.00303,"percentile":0.23072,"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."]}