{
    "id": "CVE-2009-1959",
    "published": "2009-06-08 01:00:00",
    "last_modified": "2026-06-16 23:08:27",
    "cvss_score": "5.0",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
    "cwe": "CWE-189",
    "description": "Off-by-one error in the event_wallops function in fe-common/irc/fe-events.c in irssi 0.8.13 allows remote IRC servers to cause a denial of service (crash) via an empty command, which triggers a one-byte buffer under-read and a one-byte buffer underflow.",
    "epss_score": "0.08385",
    "epss_percentile": "0.94794",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-28 18:17:08",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "irssi",
            "product": "irssi"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "33041",
            "title": "Irssi 0.8.13 - 'WALLOPS' Message Off-by-One Heap Memory Corruption",
            "date": "2009-05-15",
            "url": "https://www.exploit-db.com/exploits/33041"
        }
    ],
    "refs_list": [
        "http://bugs.irssi.org/index.php?do=details&task_id=662",
        "http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html",
        "http://secunia.com/advisories/35685",
        "http://secunia.com/advisories/35812",
        "http://secunia.com/advisories/36152",
        "http://www.irssi.org/ChangeLog",
        "http://www.mandriva.com/security/advisories?name=MDVSA-2009:133",
        "http://www.openwall.com/lists/oss-security/2009/05/29/3",
        "http://www.securityfocus.com/bid/35399",
        "http://www.securitytracker.com/id?1022410",
        "http://www.ubuntu.com/usn/usn-800-1",
        "http://www.vupen.com/english/advisories/2009/1596",
        "http://xorl.wordpress.com/2009/05/28/irssi-event_wallops-off-by-one-readwrite/",
        "https://exchange.xforce.ibmcloud.com/vulnerabilities/51184",
        "https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00146.html",
        "http://bugs.irssi.org/index.php?do=details&task_id=662",
        "http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html",
        "http://secunia.com/advisories/35685",
        "http://secunia.com/advisories/35812",
        "http://secunia.com/advisories/36152",
        "http://www.irssi.org/ChangeLog",
        "http://www.mandriva.com/security/advisories?name=MDVSA-2009:133",
        "http://www.openwall.com/lists/oss-security/2009/05/29/3",
        "http://www.securityfocus.com/bid/35399",
        "http://www.securitytracker.com/id?1022410"
    ]
}