Vulnerability Details 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, 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 53.3%
CVSS Severity
CVSS v3 Score 8.2
CVSS v2 Score 6.8
References
Products affected by CVE-2021-21708
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cpe:2.3:a:php:php:7.4.0
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cpe:2.3:a:php:php:7.4.1
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cpe:2.3:a:php:php:7.4.10
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cpe:2.3:a:php:php:7.4.11
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cpe:2.3:a:php:php:7.4.12
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cpe:2.3:a:php:php:7.4.13
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cpe:2.3:a:php:php:7.4.14
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cpe:2.3:a:php:php:7.4.15
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cpe:2.3:a:php:php:7.4.16
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cpe:2.3:a:php:php:7.4.17
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cpe:2.3:a:php:php:7.4.18
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cpe:2.3:a:php:php:7.4.19
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cpe:2.3:a:php:php:7.4.2
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cpe:2.3:a:php:php:7.4.20
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cpe:2.3:a:php:php:7.4.21
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cpe:2.3:a:php:php:7.4.22
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cpe:2.3:a:php:php:7.4.23
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cpe:2.3:a:php:php:7.4.24
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cpe:2.3:a:php:php:7.4.25
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cpe:2.3:a:php:php:7.4.26
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cpe:2.3:a:php:php:7.4.27
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cpe:2.3:a:php:php:7.4.3
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cpe:2.3:a:php:php:7.4.4
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cpe:2.3:a:php:php:7.4.5
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cpe:2.3:a:php:php:7.4.6
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cpe:2.3:a:php:php:7.4.7
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cpe:2.3:a:php:php:7.4.8
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cpe:2.3:a:php:php:7.4.9
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cpe:2.3:a:php:php:8.0.0
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cpe:2.3:a:php:php:8.0.1
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cpe:2.3:a:php:php:8.0.10
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cpe:2.3:a:php:php:8.0.11
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cpe:2.3:a:php:php:8.0.12
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cpe:2.3:a:php:php:8.0.13
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cpe:2.3:a:php:php:8.0.14
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cpe:2.3:a:php:php:8.0.15
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cpe:2.3:a:php:php:8.0.2
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cpe:2.3:a:php:php:8.0.3
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cpe:2.3:a:php:php:8.0.4
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cpe:2.3:a:php:php:8.0.5
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cpe:2.3:a:php:php:8.0.6
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cpe:2.3:a:php:php:8.0.7
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cpe:2.3:a:php:php:8.0.8
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cpe:2.3:a:php:php:8.0.9
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cpe:2.3:a:php:php:8.1.0
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cpe:2.3:a:php:php:8.1.1
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cpe:2.3:a:php:php:8.1.2