Security advisory

{
  "id": "9a82dcbb831ea56313c742171ec096e45eafabf9370266622106da9940b01ee0",
  "url": "https://osv.dev/vulnerability/CVE-2021-21707",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21707",
    "summary": "In PHP versions 7.3.x below 7.3.33, 7.4.x below 7.4.26 and 8.0.x below 8.0.13, certain XML parsing functions, like simplexml_load_file(), URL-decode the filename passed to them. If that filename contains URL-encoded NUL character, this may cause the function to interpret this as the end of the filename, thus interpreting the filename differently from what the user intended, which may lead it to reading a different file than intended.",
    "evidence": "osv:CVE-2021-21707",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-21707",
      "aliases": [
        "BIT-libphp-2021-21707",
        "BIT-php-2021-21707",
        "BIT-php-min-2021-21707",
        "CVE-2021-21707"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/php/php-src",
              "type": "GIT",
              "events": [
                {
                  "introduced": "52ace952a1b65ca80fc2617f11c2fa6dd03f51bd"
                },
                {
                  "fixed": "c796a801599b13943c2413589e339c39d1d4bb47"
                },
                {
                  "introduced": "3c7824e16ec4c3cee417262445d2c2b66531c10f"
                },
                {
                  "fixed": "5f762668c9b57fa860ade2936796a24c258ca48e"
                },
                {
                  "introduced": "5dc92c2117cafc61daaaaa240fd46c3ac33872a4"
                },
                {
                  "fixed": "4850f51d29ae7ede1c528387b595f671bb81a79f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "7.3.0"
                      },
                      {
                        "fixed": "7.3.33"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "7.4.0"
                      },
                      {
                        "fixed": "7.4.26"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0"
                      },
                      {
                        "fixed": "8.0.13"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21707.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:37.596799237Z",
      "provider": "osv",
      "references": [
        "https://security.netapp.com/advisory/ntap-20211223-0005/",
        "https://www.debian.org/security/2022/dsa-5082",
        "https://lists.debian.org/debian-lts-announce/2022/12/msg00030.html",
        "https://bugs.php.net/bug.php?id=79971",
        "https://www.tenable.com/security/tns-2022-09"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "tenable:tenable.sc",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "5.21.0"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  },
                  {
                    "introduced": "11.0"
                  },
                  {
                    "last_affected": "11.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-21707",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 434261,
  "published_at": "2021-11-29T07:15:06.397+00:00"
}