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_VALIDATE_FLOAT filter and min/max limits, if the filter fails, there is a possibility to trigger use of allocated memory after free,…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.00%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.00% probability · 87th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- php/php
- Source
- security@php.net
References
- https://bugs.php.net/bug.php?id=81708Exploit, Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202209-20Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220325-0004/Third Party Advisory
- https://bugs.php.net/bug.php?id=81708Exploit, Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202209-20Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220325-0004/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.