Home/CVE/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_V
CVE

CVE-2021-21708

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_V

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.

HIGH · CVSS 8.2 EPSS 0.00218
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-416Use After Free
CWE-416Use After Free
▤

Affected Products & Versions

3
php>= 7.4.0 and < 7.4.28
php>= 8.0.0 and < 8.0.16
php>= 8.1.0 and < 8.1.3
⚠

Public Exploits & PoCs

1
pocbugs.php.net · bug.php?id=81708bugs.php.net
▣

Scoring & Timeline

8.2
HIGH · CVSS v3.1 · security@php.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Feb 2022 · 08:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
⚑

Vendor Advisories

19
msrcCVE-2021-21708
suse-csafopenSUSE-SU-2024:11854-1
suse-csafopenSUSE-SU-2024:11861-1
siemens-csafSSA-455250
suse-csafSUSE-SU-2022:4068-1
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://security.gentoo.org/glsa/202209-20Third Party Advisory
https://security.netapp.com/advisory/ntap-20220325-0004/Third Party Advisory
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