CVE-2021-21708 Vulnerability Details

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CVE-2021-21708 Metadata Quick Info

CVE Published: 27/02/2022 | CVE Updated: 17/09/2024 | CVE Year: 2021
Source: php | Vendor: PHP Group | Product: PHP
Status : PUBLISHED

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CVE-2021-21708 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.

Metrics

CVSS Version: 3.1 | Base Score: 8.2 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

l➤ Exploitability Metrics:
    Attack Vector (AV)* NETWORK
    Attack Complexity (AC)* LOW
    Privileges Required (PR)* NONE
    User Interaction (UI)* NONE
    Scope (S)* UNCHANGED

l➤ Impact Metrics:
    Confidentiality Impact (C)* NONE
    Integrity Impact (I)* HIGH
    Availability Impact (A)* LOW

Weakness Enumeration (CWE)

CWE-ID: CWE-416
CWE Name: CWE-416 Use After Free
Source: PHP Group

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-ID:
CAPEC Description:


Source: NVD (National Vulnerability Database).