Apache HTTP Server: mod_ssl error log variable escaping

{
  "id": "fac7b58431c0c4155a67f08e7751faab25c6a06f05a9176d818cd8f90490198b",
  "url": "https://osv.dev/vulnerability/CVE-2024-47252",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Apache HTTP Server: mod_ssl error log variable escaping",
    "summary": "Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging configuration where CustomLog is used with \"%{varname}x\" or \"%{varname}c\" to log variables provided by mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized data provided by the client may appear in log files.",
    "evidence": "osv:CVE-2024-47252",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-47252",
      "aliases": [
        "BIT-apache-2024-47252",
        "CVE-2024-47252"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apache/httpd",
              "type": "GIT",
              "events": [
                {
                  "introduced": "da5873e80d6eee7a0838793bf68f1d0254745fbb"
                },
                {
                  "fixed": "7e926454793abd7d71b6afc8bd1ec1648752c6ad"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.4.0"
                      },
                      {
                        "fixed": "2.4.64"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47252.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.008200552Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47252.json",
        "https://httpd.apache.org/security/vulnerabilities_24.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-47252"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-150"
        ],
        "cna_assigner": "apache",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "2.4"
                  },
                  {
                    "last_affected": "2.4.63"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47252.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-47252",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518571,
  "published_at": "2025-07-10T16:55:20.013+00:00"
}