{
  "id": "CVE-2023-4911",
  "url": "https://spydr.io/cve/CVE-2023-4911",
  "published": "2023-10-03T18:15:10.463Z",
  "modified": "2026-06-17T06:38:52.787Z",
  "score": 7.8,
  "severity": "high",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "score_source": "NVD",
  "epss": 0.63769,
  "epss_percentile": 0.99202,
  "exploited": true,
  "kev": {
    "added": "2023-11-21",
    "due": "2023-12-12",
    "action": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
    "ransomware": "Unknown",
    "name": "GNU C Library Buffer Overflow Vulnerability",
    "notes": "This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa, https://access.redhat.com/security/cve/cve-2023-4911, https://www.debian.org/security/2023/dsa-5514 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4911"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "Red Hat",
    "Siemens"
  ],
  "products": [
    "Red Hat Enterprise Linux 8",
    "Red Hat Enterprise Linux 8.6 Extended Update Support",
    "Red Hat Enterprise Linux 9",
    "Red Hat Enterprise Linux 9.0 Extended Update Support",
    "Red Hat Virtualization 4 for Red Hat Enterprise Linux 8",
    "Red Hat Enterprise Linux 6",
    "Red Hat Enterprise Linux 7",
    "Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP",
    "Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP",
    "Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP"
  ],
  "cwes": [
    "CWE-122",
    "CWE-787"
  ],
  "description": "A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 7.8,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://access.redhat.com/errata/RHSA-2023:5453",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2023:5454",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2023:5455",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2023:5476",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2024:0033",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://access.redhat.com/security/cve/CVE-2023-4911",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2238352",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
    },
    {
      "url": "https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.qualys.com/cve-2023-4911/",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "http://packetstormsecurity.com/files/174986/glibc-ld.so-Local-Privilege-Escalation.html",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ]
    },
    {
      "url": "http://packetstormsecurity.com/files/176288/Glibc-Tunables-Privilege-Escalation.html",
      "tags": [
        "Exploit",
        "Third Party Advisory",
        "VDB Entry"
      ]
    },
    {
      "url": "http://seclists.org/fulldisclosure/2023/Oct/11",
      "tags": [
        "Exploit",
        "Mailing List",
        "Third Party Advisory"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/10/03/2",
      "tags": [
        "Exploit",
        "Mailing List"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/10/03/3",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/10/05/1",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/10/13/11",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/10/14/3",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/10/14/5",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/10/14/6",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4DBUQRRPB47TC3NJOUIBVWUGFHBJAFDL/",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFG4P76UHHZEWQ26FWBXG76N2QLKKPZA/",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NDAQWHTSVOCOZ5K6KPIWKRT3JX4RTZUR/",
      "tags": [
        "Mailing List"
      ]
    },
    {
      "url": "https://security.gentoo.org/glsa/202310-03",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20231013-0006/",
      "tags": [
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.debian.org/security/2023/dsa-5514",
      "tags": [
        "Mailing List"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4911",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}