CVE-2021-21708
CRITICAL9.8EPSS 0.22%UAF due to php_filter_float() failing
Published: 2/27/2022Modified: 4/28/2026
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.
Affected packages (4)
- Bitnami/libphp>= 7.4.0, < 7.4.28, >= 8.0.0, < 8.0.16, >= 8.1.0, < 8.1.3
- Bitnami/php>= 7.4.0, < 7.4.28, >= 8.0.0, < 8.0.16, >= 8.1.0, < 8.1.3
- Bitnami/php-min>= 7.4.0, < 7.4.28, >= 8.0.0, < 8.0.16, >= 8.1.0, < 8.1.3
- Debian/php7.4from 0, < 7.4.28-1+deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |