{
    "id": "CVE-2021-27135",
    "published": "2021-02-10 16:15:13",
    "last_modified": "2026-06-17 03:44:19",
    "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": null,
    "description": "xterm before Patch #366 allows remote attackers to execute arbitrary code or cause a denial of service (segmentation fault) via a crafted UTF-8 combining character sequence.",
    "epss_score": "0.07844",
    "epss_percentile": "0.94519",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-05 18:17:25",
    "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": "invisible-island",
            "product": "xterm"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://seclists.org/fulldisclosure/2021/May/52",
        "http://www.openwall.com/lists/oss-security/2021/02/10/7",
        "https://access.redhat.com/security/cve/CVE-2021-27135",
        "https://bugzilla.redhat.com/show_bug.cgi?id=1927559",
        "https://bugzilla.suse.com/show_bug.cgi?id=1182091",
        "https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c",
        "https://invisible-island.net/xterm/xterm.log.html",
        "https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/",
        "https://news.ycombinator.com/item?id=26524650",
        "https://security.gentoo.org/glsa/202208-22",
        "https://www.openwall.com/lists/oss-security/2021/02/09/7",
        "https://www.openwall.com/lists/oss-security/2021/02/09/9",
        "http://seclists.org/fulldisclosure/2021/May/52",
        "http://www.openwall.com/lists/oss-security/2021/02/10/7",
        "https://access.redhat.com/security/cve/CVE-2021-27135",
        "https://bugzilla.redhat.com/show_bug.cgi?id=1927559",
        "https://bugzilla.suse.com/show_bug.cgi?id=1182091",
        "https://github.com/ThomasDickey/xterm-snapshots/commit/82ba55b8f994ab30ff561a347b82ea340ba7075c",
        "https://invisible-island.net/xterm/xterm.log.html",
        "https://lists.debian.org/debian-lts-announce/2021/02/msg00019.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/35LK2ZXEIJUOGOA7FV2TJL3L6LFJ4X5S/",
        "https://news.ycombinator.com/item?id=26524650",
        "https://security.gentoo.org/glsa/202208-22",
        "https://www.openwall.com/lists/oss-security/2021/02/09/7"
    ]
}