Junos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will crash_CVE-2026-21920

{
    "lastseen": "",
    "description": "An Unchecked Return Value vulnerability in the DNS module of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\n\n\n\n\nIf an SRX Series device configured for DNS processing, receives a specifically formatted DNS request flowd will crash and restart, which causes a service interruption until the process has recovered.\n\nThis issue affects Junos OS on SRX Series:\n\n\n\n  *  23.4 versions before 23.4R2-S5,\n  *  24.2 versions before 24.2R2-S1,\n  *  24.4 versions before 24.4R2.\n\n\n\n\n\n\nThis issue does not affect Junos OS versions before 23.4R1.",
    "published": "2026-01-15T20:28:10.526Z",
    "modified": "2026-01-15T20:28:10.526Z",
    "type": "cve",
    "title": "Junos OS: SRX Series: If a specific request is processed by the DNS subsystem flowd will crash",
    "source": "juniper",
    "references": "https://supportportal.juniper.net/JSA106020\nhttps://kb.juniper.net/JSA106020",
    "id": "CVE-2026-21920",
    "bulletinFamily": "",
    "cwe": [
        "CWE-252"
    ],
    "cvelist": null,
    "sourceData": "Juniper Networks Junos OS 23.4\nJuniper Networks Junos OS 24.2\nJuniper Networks Junos OS 24.4",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Junos OS",
    "version": "23.4",
    "vendor": "Juniper Networks",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}