title: UAF due to php_filter_float() failing
description: 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.
problem types: CWE-416 Use After Free
affected:
{
product: PHP
vendor: PHP Group
versions:
lessThan: 7.4.28, status: affected, version: 7.4.x, versionType: custom
lessThan: 8.0.16, status: affected, version: 8.0.X, versionType: custom
lessThan: 8.1.3, status: affected, version: 8.1.X, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 8.2
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
version: 3.1
]