CVE-2021-21708 (GCVE-0-2021-21708)

Vulnerability from cvelistv5 – Published: 2022-02-27 08:00 – Updated: 2024-09-17 03:18
VLAI
Title
UAF due to php_filter_float() failing
Summary
In PHP versions 7.4.x below 7.4.28, 8.0.x below 8.0.16, and 8.1.x below 8.1.3, when using filter functions with FILTER_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free, which can result it crashes, and potentially in overwrite of other memory chunks and RCE. This issue affects: code that uses FILTER_VALIDATE_FLOAT with min/max limits.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
CWE
Assigner
php CNA under the mitre root
CNA scorecard B 80/100 over 25 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
PHP Group PHP Affected: 7.4.x , < 7.4.28 (custom)
Affected: 8.0.X , < 8.0.16 (custom)
Affected: 8.1.X , < 8.1.3 (custom)
guessed Create a notification for this product.
Date Public
2022-02-14 00:00
Credits
dukk at softdev dot online
Show details on NVD website
To clipboard 

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        ],
        "sourceIdentifier": "security@php.net",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "security@php.net",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-06T14:29:57+00:00",
      "cve": "CVE-2021-21708",
      "id": "CVE-2021-21708",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:fixed": "1571",
      "product_status:known_not_affected": "84",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "php: Use after free due to php_filter_float() failing for ints",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-21708.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-13T23:58:17Z",
      "cve": "CVE-2021-21708",
      "id": "CVE-2021-21708",
      "initial_release_date": "2023-02-15T03:46:08Z",
      "product_status:known_not_affected": "3133",
      "product_status:recommended": "2748",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-21708",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-21708.json",
      "version": "23"
    }
  }
}



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