CVE-2021-21708

High

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.

SeverityHigh

CVSS8.2

Exploit probability—

Product

Php

PublishedFeb 27, 2022

First seenFeb 27, 2022

Weakness typeCWE-416Use after free

How to fix

Update

php php7.4.28, 8.0.16, 8.1.3 or later

Vendor advisories

security.gentoo.org/glsa/202209-20

Affected products

Product	Affected versions	Fixed in
php php	7.4.0 ≤ v < 7.4.28, 8.0.0 ≤ v < 8.0.16, 8.1.0 ≤ v < 8.1.3	7.4.28, 8.0.16, 8.1.3

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