CVE-2021-21708

UAF due to php_filter_float() failing

State: Published
Severity: 8.2 High
Published: Feb 27, 2022
Updated: Sep 17, 2024
Reserved: Jan 4, 2021

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.

Scores

CVSS	Score	Vector	Source
3.1	8.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L	php

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
PHPPHP Group	7.4.x to before 7.4.28Affected 8.0.X to before 8.0.16Affected 8.1.X to before 8.1.3Affected

References

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