AudioCodes Fax/IVR Appliance <= 2.6.23 Unauthenticated Backup Upload RCE via ajaxBackupUploadFile.php_CVE-2025-34329

{
    "lastseen": "",
    "description": "AudioCodes Fax Server and Auto-Attendant IVR appliances versions up to and including 2.6.23 expose an unauthenticated backup upload endpoint at AudioCodes_files/ajaxBackupUploadFile.php in the F2MAdmin web interface. The script derives a backup folder path from application configuration, creates the directory if it does not exist, and then moves an uploaded file to that location using the attacker-controlled filename, without any authentication, authorization, or file-type validation. On default Windows deployments where the backup directory resolves to the system drive, a remote attacker can upload web server or interpreter configuration files that cause a log file or other server-controlled resource to be treated as executable code. This allows subsequent HTTP requests to trigger arbitrary command execution under the web server account, which runs as NT AUTHORITY\\\\SYSTEM.",
    "published": "2025-11-19T16:23:09.072Z",
    "modified": "2025-11-19T18:20:51.411Z",
    "type": "cve",
    "title": "AudioCodes Fax/IVR Appliance <= 2.6.23 Unauthenticated Backup Upload RCE via ajaxBackupUploadFile.php",
    "source": "VulnCheck",
    "references": "https://www.audiocodes.com/media/g1in2u2o/0548-product-notice-end-of-service-for-audiocodes-auto-attendant-ivr-solution.pdf\nhttps://pierrekim.github.io/blog/2025-11-20-audiocodes-fax-ivr-8-vulnerabilities.html\nhttps://pierrekim.github.io/advisories/2025-audiocodes-fax-ivr.txt\nhttps://www.vulncheck.com/advisories/audiocodes-fax-ivr-appliance-unauthenticated-backup-upload-rce-via-ajaxbackupuploadfile",
    "id": "CVE-2025-34329",
    "bulletinFamily": "",
    "cwe": [
        "CWE-434"
    ],
    "cvelist": null,
    "sourceData": "AudioCodes Limited AudioCodes Fax/IVR Appliance 0",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "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": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "AudioCodes Fax/IVR Appliance",
    "version": "0",
    "vendor": "AudioCodes Limited",
    "ai_description": "Unauthenticated backup upload vulnerability allowing arbitrary command execution under the web server account",
    "ai_severity": "Critical",
    "ai_vendor": "AudioCodes Limited",
    "ai_product": "AudioCodes Fax/IVR Appliance",
    "ai_version": "2.6.23 and earlier",
    "ai_score": 9.3
}