{
    "id": "CVE-2003-0540",
    "published": "2003-08-27 04:00:00",
    "last_modified": "2026-06-16 22:02:23",
    "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": null,
    "description": "The address parser code in Postfix 1.1.12 and earlier allows remote attackers to cause a denial of service (lock) via (1) a malformed envelope address to a local host that would generate a bounce and contains the \".!\" string in the MAIL FROM or Errors-To headers, which causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO containing a \".!\" string, which causes an instance of the SMTP listener to lock up.",
    "epss_score": "0.21261",
    "epss_percentile": "0.97522",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-27 18:17:03",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "conectiva",
            "product": "linux"
        },
        {
            "vendor": "wietse_venema",
            "product": "postfix"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "22981",
            "title": "Postfix 1.1.x - Denial of Service (1)",
            "date": "2003-08-04",
            "url": "https://www.exploit-db.com/exploits/22981"
        },
        {
            "source": "exploit-db",
            "ref_id": "22982",
            "title": "Postfix 1.1.x - Denial of Service (2)",
            "date": "2003-08-04",
            "url": "https://www.exploit-db.com/exploits/22982"
        }
    ],
    "refs_list": [
        "http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000717",
        "http://lists.grok.org.uk/pipermail/full-disclosure/2003-August/007693.html",
        "http://marc.info/?l=bugtraq&m=106001525130257&w=2",
        "http://marc.info/?l=bugtraq&m=106029188614704&w=2",
        "http://secunia.com/advisories/9433",
        "http://www.debian.org/security/2003/dsa-363",
        "http://www.kb.cert.org/vuls/id/895508",
        "http://www.linuxsecurity.com/advisories/engarde_advisory-3517.html",
        "http://www.mandriva.com/security/advisories?name=MDKSA-2003:081",
        "http://www.novell.com/linux/security/advisories/2003_033_postfix.html",
        "http://www.redhat.com/support/errata/RHSA-2003-251.html",
        "http://www.securityfocus.com/bid/8333",
        "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A544",
        "http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000717",
        "http://lists.grok.org.uk/pipermail/full-disclosure/2003-August/007693.html",
        "http://marc.info/?l=bugtraq&m=106001525130257&w=2",
        "http://marc.info/?l=bugtraq&m=106029188614704&w=2",
        "http://secunia.com/advisories/9433",
        "http://www.debian.org/security/2003/dsa-363",
        "http://www.kb.cert.org/vuls/id/895508",
        "http://www.linuxsecurity.com/advisories/engarde_advisory-3517.html",
        "http://www.mandriva.com/security/advisories?name=MDKSA-2003:081",
        "http://www.novell.com/linux/security/advisories/2003_033_postfix.html",
        "http://www.redhat.com/support/errata/RHSA-2003-251.html",
        "http://www.securityfocus.com/bid/8333"
    ]
}