{
    "id": "CVE-2021-44143",
    "published": "2021-11-22 20:15:18",
    "last_modified": "2026-06-17 04:11:56",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-787",
    "description": "A flaw was found in mbsync in isync 1.4.0 through 1.4.3. Due to an unchecked condition, a malicious or compromised IMAP server could use a crafted mail message that lacks headers (i.e., one that starts with an empty line) to provoke a heap overflow, which could conceivably be exploited for remote code execution.",
    "epss_score": "0.03783",
    "epss_percentile": "0.89680",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-08 18:17:29",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "fedoraproject",
            "product": "fedora"
        },
        {
            "vendor": "isync_project",
            "product": "isync"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://www.openwall.com/lists/oss-security/2021/12/03/2",
        "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999804",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CYZ2GNB4ZO2T27D2XNUWMCS3THZYSJQU/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCBSY7OZ57XNC6ZYXF6WU5KBSWITZVDX/",
        "https://security.gentoo.org/glsa/202208-15",
        "https://sourceforge.net/p/isync/isync/commit_browser",
        "https://sourceforge.net/p/isync/isync/ref/master/tags/",
        "http://www.openwall.com/lists/oss-security/2021/12/03/2",
        "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999804",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CYZ2GNB4ZO2T27D2XNUWMCS3THZYSJQU/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCBSY7OZ57XNC6ZYXF6WU5KBSWITZVDX/",
        "https://security.gentoo.org/glsa/202208-15",
        "https://sourceforge.net/p/isync/isync/commit_browser",
        "https://sourceforge.net/p/isync/isync/ref/master/tags/"
    ]
}