Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2021-21708 Details

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

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://bugs.php.net/bug.php?id=81708 CVEExploitIssue TrackingPatchVendor Advisory
https://security.gentoo.org/glsa/202209-20 CVEThird Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0004/ CVEThird Party Advisory
https://bugs.php.net/bug.php?id=81708 [email protected]ExploitIssue TrackingPatchVendor Advisory
https://security.gentoo.org/glsa/202209-20 [email protected]Third Party Advisory

see all 6 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-416Use After Free[email protected]
CWE-416Use After Free[email protected]

Affected Products

ProductVersions
php php
>= 7.4.0, < 7.4.28
>= 8.0.0, < 8.0.16
>= 8.1.0, < 8.1.3

CPE

  • cpe:2.3:a:php:php:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

9 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-21708
NVD Published Date:
Feb 27, 2022
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2021-21708 Details - Not Deferred