{
    "id": "CVE-2021-26937",
    "published": "2021-02-09 20:15:14",
    "last_modified": "2026-06-17 03:44:02",
    "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-88",
    "description": "encoding.c in GNU Screen through 4.8.0 allows remote attackers to cause a denial of service (invalid write access and application crash) or possibly have unspecified other impact via a crafted UTF-8 character sequence.",
    "epss_score": "0.09147",
    "epss_percentile": "0.95184",
    "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": "gnu",
            "product": "screen"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://www.openwall.com/lists/oss-security/2021/02/09/8",
        "https://ftp.gnu.org/gnu/screen/",
        "https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/",
        "https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html",
        "https://security.gentoo.org/glsa/202105-11",
        "https://www.debian.org/security/2021/dsa-4861",
        "https://www.openwall.com/lists/oss-security/2021/02/09/3",
        "http://www.openwall.com/lists/oss-security/2021/02/09/8",
        "https://ftp.gnu.org/gnu/screen/",
        "https://lists.debian.org/debian-lts-announce/2021/02/msg00031.html",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GNWBOIDEPOEQS5RMQVMFKHKXJCGNYWBL/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJWLXP45POUUYBJRRWPVAWNZDJTLYWVM/",
        "https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html",
        "https://security.gentoo.org/glsa/202105-11",
        "https://security.netapp.com/advisory/ntap-20250509-0004/",
        "https://www.debian.org/security/2021/dsa-4861",
        "https://www.openwall.com/lists/oss-security/2021/02/09/3"
    ]
}