{
    "id": "CVE-2020-15917",
    "published": "2020-07-23 19:15:10",
    "last_modified": "2026-06-17 02:57:23",
    "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": "common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled.",
    "epss_score": "0.02614",
    "epss_percentile": "0.85039",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-13 18:17:24",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "claws-mail",
            "product": "claws-mail"
        },
        {
            "vendor": "fedoraproject",
            "product": "fedora"
        },
        {
            "vendor": "opensuse",
            "product": "backports_sle"
        },
        {
            "vendor": "opensuse",
            "product": "leap"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html",
        "https://git.claws-mail.org/?p=claws.git%3Ba=blob%3Bf=RELEASE_NOTES",
        "https://git.claws-mail.org/?p=claws.git%3Ba=commit%3Bh=fcc25329049b6f9bd8d890f1197ed61eb12e14d5",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YVQB7NRBHO67Q74RS7RZCMW4ENRVBB4/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVEUB764EUM5/",
        "https://security.gentoo.org/glsa/202007-56",
        "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00090.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00002.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00060.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00051.html",
        "http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00013.html",
        "https://git.claws-mail.org/?p=claws.git%3Ba=blob%3Bf=RELEASE_NOTES",
        "https://git.claws-mail.org/?p=claws.git%3Ba=commit%3Bh=fcc25329049b6f9bd8d890f1197ed61eb12e14d5",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YVQB7NRBHO67Q74RS7RZCMW4ENRVBB4/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G7UX65342HRVDQML4G4GEVEUB764EUM5/",
        "https://security.gentoo.org/glsa/202007-56"
    ]
}