Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request_CVE-2025-57767

{
    "lastseen": "",
    "description": "Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.15.2, 21.10.2, and 22.5.2, if a SIP request is received with an Authorization header that contains a realm that wasn't in a previous 401 response's WWW-Authenticate header, or an Authorization header with an incorrect realm was received without a previous 401 response being sent, the get_authorization_header() function in res_pjsip_authenticator_digest will return a NULL. This wasn't being checked before attempting to get the digest algorithm from the header which causes a SEGV. This issue has been patched in versions 20.15.2, 21.10.2, and 22.5.2. There are no workarounds.",
    "published": "2025-08-28T15:33:00.087Z",
    "modified": "2025-08-28T15:33:00.087Z",
    "type": "cve",
    "title": "Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request",
    "source": "GitHub_M",
    "references": "https://github.com/asterisk/asterisk/security/advisories/GHSA-64qc-9x89-rx5j\nhttps://github.com/asterisk/asterisk/pull/1407\nhttps://github.com/asterisk/asterisk/commit/02993717b08f899d4aca9888062f35dfb198584f",
    "id": "CVE-2025-57767",
    "bulletinFamily": "",
    "cwe": [
        "CWE-253"
    ],
    "cvelist": null,
    "sourceData": "asterisk asterisk < 22.5.2\nasterisk asterisk < 21.10.2\nasterisk asterisk < 20.15.2",
    "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": "asterisk",
    "version": "< 22.5.2",
    "vendor": "asterisk",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}