{
    "id": "CVE-2021-42013",
    "published": "2021-10-07 16:15:09",
    "last_modified": "2026-06-17 04:09:09",
    "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-22",
    "description": "It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration \"require all denied\", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.",
    "epss_score": "0.99964",
    "epss_percentile": "0.99976",
    "kev": 1,
    "kev_due": "2021-11-17",
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:28:09",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2021-11-17."
    },
    "products": [
        {
            "vendor": "apache",
            "product": "http_server"
        },
        {
            "vendor": "fedoraproject",
            "product": "fedora"
        },
        {
            "vendor": "netapp",
            "product": "cloud_backup"
        },
        {
            "vendor": "oracle",
            "product": "instantis_enterprisetrack"
        },
        {
            "vendor": "oracle",
            "product": "jd_edwards_enterpriseone_tools"
        },
        {
            "vendor": "oracle",
            "product": "secure_backup"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-42013",
        "date_added": "2021-11-03",
        "due_date": "2021-11-17",
        "vendor": "Apache",
        "product": "HTTP Server",
        "name": "Apache HTTP Server Path Traversal Vulnerability",
        "ransomware": 1
    },
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "50512",
            "title": "Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (3)",
            "date": "2021-11-11",
            "url": "https://www.exploit-db.com/exploits/50512"
        },
        {
            "source": "exploit-db",
            "ref_id": "50446",
            "title": "Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (2)",
            "date": "2021-10-25",
            "url": "https://www.exploit-db.com/exploits/50446"
        },
        {
            "source": "exploit-db",
            "ref_id": "50406",
            "title": "Apache HTTP Server 2.4.50 - Path Traversal & Remote Code Execution (RCE)",
            "date": "2021-10-13",
            "url": "https://www.exploit-db.com/exploits/50406"
        }
    ],
    "refs_list": [
        "http://jvn.jp/en/jp/JVN51106450/index.html",
        "http://packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html",
        "http://packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html",
        "http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html",
        "http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html",
        "http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html",
        "http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html",
        "http://www.openwall.com/lists/oss-security/2021/10/07/6",
        "http://www.openwall.com/lists/oss-security/2021/10/08/1",
        "http://www.openwall.com/lists/oss-security/2021/10/08/2",
        "http://www.openwall.com/lists/oss-security/2021/10/08/3",
        "http://www.openwall.com/lists/oss-security/2021/10/08/4",
        "http://www.openwall.com/lists/oss-security/2021/10/08/5",
        "http://www.openwall.com/lists/oss-security/2021/10/08/6",
        "http://www.openwall.com/lists/oss-security/2021/10/09/1",
        "http://www.openwall.com/lists/oss-security/2021/10/11/4",
        "http://www.openwall.com/lists/oss-security/2021/10/15/3",
        "http://www.openwall.com/lists/oss-security/2021/10/16/1",
        "https://httpd.apache.org/security/vulnerabilities_24.html",
        "https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E",
        "https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E",
        "https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/",
        "https://security.gentoo.org/glsa/202208-20"
    ]
}