CIDR deny policies may not take effect when a more narrow CIDR allow is present

{
  "id": "22fc804b0e8312a56bd3d6409c0651f4873ed6a25f2b51ca3b16962fd971ebf9",
  "url": "https://osv.dev/vulnerability/CVE-2024-47825",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CIDR deny policies may not take effect when a more narrow CIDR allow is present",
    "summary": "Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Starting in version 1.14.0 and prior to versions 1.14.16 and 1.15.10, a policy rule denying a prefix that is broader than `/32` may be ignored if there is a policy rule referencing a more narrow prefix (`CIDRSet` or `toFQDN`) and this narrower policy rule specifies either `enableDefaultDeny: false` or `- toEntities: all`. Note that a rule specifying `toEntities: world` or `toEntities: 0.0.0.0/0` is insufficient, it must be to entity `all`.This issue has been patched in Cilium v1.14.16 and v1.15.10. As this issue only affects policies using `enableDefaultDeny: false` or that set `toEntities` to `all`, some workarounds are available. For users with policies using `enableDefaultDeny: false`, remove this configuration option and explicitly define any allow rules required. For users with egress policies that explicitly specify `toEntities: all`, use `toEntities: world`.",
    "evidence": "osv:CVE-2024-47825",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-47825",
      "aliases": [
        "BIT-cilium-2024-47825",
        "BIT-cilium-operator-2024-47825",
        "BIT-hubble-relay-2024-47825",
        "CVE-2024-47825",
        "GHSA-3wwx-63fv-pfq6",
        "GO-2024-3208"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cilium/cilium",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b5013e1562dbfe442dd2011a5af46de9095315ff"
                },
                {
                  "fixed": "c2fcf1db31b1b408662471cbe1fddd121bd9678a"
                },
                {
                  "introduced": "2db45c468981a863b230186ad37d44e5a7c08d61"
                },
                {
                  "fixed": "2fdab41a13d2a3f8abbbb4d3b4ba8cc1624c3935"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.14.0"
                      },
                      {
                        "fixed": "1.14.16"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.15.0"
                      },
                      {
                        "fixed": "1.15.10"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.15.9",
            "1.15.9",
            "v1.14.15",
            "1.14.15",
            "v1.14.14",
            "1.14.14",
            "v1.15.8",
            "1.15.8",
            "v1.15.7",
            "1.15.7",
            "v1.14.13",
            "1.14.13",
            "v1.15.6",
            "1.15.6",
            "v1.14.12",
            "1.14.12",
            "v1.14.11",
            "1.14.11",
            "v1.15.5",
            "1.15.5",
            "v1.15.4",
            "1.15.4",
            "v1.14.10",
            "1.14.10",
            "v1.14.9",
            "1.14.9",
            "v1.15.3",
            "1.15.3",
            "v1.14.8",
            "1.14.8",
            "v1.15.2",
            "1.15.2",
            "v1.15.1",
            "1.15.1",
            "v1.14.7",
            "1.14.7",
            "v1.15.0",
            "1.15.0",
            "v1.14.6",
            "1.14.6",
            "v1.14.5",
            "1.14.5",
            "v1.14.4",
            "1.14.4",
            "v1.14.3",
            "1.14.3",
            "v1.14.2",
            "1.14.2",
            "v1.14.1",
            "1.14.1",
            "v1.14.0",
            "1.14.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47825.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.645076438Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47825.json",
        "https://github.com/cilium/cilium/security/advisories/GHSA-3wwx-63fv-pfq6",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-47825"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-276"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47825.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-47825",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507020,
  "published_at": "2024-10-21T19:05:55.43+00:00"
}