{
    "id": "CVE-2007-4321",
    "published": "2007-08-14 00:17:00",
    "last_modified": "2026-06-16 22:43:48",
    "cvss_score": "6.8",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
    "cwe": null,
    "description": "fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6302.",
    "epss_score": "0.05748",
    "epss_percentile": "0.92840",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-02 18:17:07",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "fail2ban",
            "product": "fail2ban"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "30430",
            "title": "Fail2ban 0.8 - Remote Denial of Service",
            "date": "2007-07-28",
            "url": "https://www.exploit-db.com/exploits/30430"
        }
    ],
    "refs_list": [
        "http://bugs.gentoo.org/show_bug.cgi?id=181214",
        "http://osvdb.org/42484",
        "http://secunia.com/advisories/23237",
        "http://secunia.com/advisories/28374",
        "http://security.gentoo.org/glsa/glsa-200707-13.xml",
        "http://www.debian.org/security/2008/dsa-1456",
        "http://www.ossec.net/en/attacking-loganalysis.html",
        "http://www.securityfocus.com/bid/25117",
        "http://bugs.gentoo.org/show_bug.cgi?id=181214",
        "http://osvdb.org/42484",
        "http://secunia.com/advisories/23237",
        "http://secunia.com/advisories/28374",
        "http://security.gentoo.org/glsa/glsa-200707-13.xml",
        "http://www.debian.org/security/2008/dsa-1456",
        "http://www.ossec.net/en/attacking-loganalysis.html",
        "http://www.securityfocus.com/bid/25117"
    ]
}