{
    "id": "CVE-2021-27877",
    "published": "2021-03-01 22:15:14",
    "last_modified": "2026-06-17 03:45:32",
    "cvss_score": "8.2",
    "cvss_severity": "HIGH",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
    "cwe": null,
    "description": "An issue was discovered in Veritas Backup Exec before 21.2. It supports multiple authentication schemes: SHA authentication is one of these. This authentication scheme is no longer used in current versions of the product, but hadn't yet been disabled. An attacker could remotely exploit this scheme to gain unauthorized access to an Agent and execute privileged commands.",
    "epss_score": "0.64910",
    "epss_percentile": "0.99225",
    "kev": 1,
    "kev_due": "2023-04-28",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:27:08",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2023-04-28."
    },
    "products": [
        {
            "vendor": "veritas",
            "product": "backup_exec"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-27877",
        "date_added": "2023-04-07",
        "due_date": "2023-04-28",
        "vendor": "Veritas",
        "product": "Backup Exec Agent",
        "name": "Veritas Backup Exec Agent Improper Authentication Vulnerability",
        "ransomware": 1
    },
    "exploits": [],
    "refs_list": [
        "http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html",
        "https://www.veritas.com/content/support/en_US/security/VTS21-001#issue1",
        "http://packetstormsecurity.com/files/168506/Veritas-Backup-Exec-Agent-Remote-Code-Execution.html",
        "https://www.veritas.com/content/support/en_US/security/VTS21-001#issue1",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27877"
    ]
}