p PatchFirst

CVE-2021-21708

CVE-2021-21708 · UAF due to php_filter_float() failing

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 8.2 · High · EPSS 3.0% · Fix available

Published
Updated

Stack: system · php

Affected products and versions

  • php

    Versions
    • ≥ 7.4.x, < 7.4.28: Affected (custom)
    • ≥ 8.0.X, < 8.0.16: Affected (custom)
    • ≥ 8.1.X, < 8.1.3: Affected (custom)

    Update to 7.4.28; Update to 8.0.16; Update to 8.1.3

  • php7.4 Debian:11

    Versions
    • 7.4.21-1+deb11u1
    • 7.4.25-1+deb11u1
    • 7.4.26-1
    Affected ranges
    • ECOSYSTEM: < 7.4.28-1+deb11u1

    Update to 7.4.28-1+deb11u1

  • php7.4 Ubuntu:20.04:LTS

    Versions
    • 7.4.3-4build1
    • 7.4.3-4build2
    • 7.4.3-4ubuntu1
    • 7.4.3-4ubuntu1.1
    • 7.4.3-4ubuntu2.2
    • 7.4.3-4ubuntu2.4
    • 7.4.3-4ubuntu2.5
    • 7.4.3-4ubuntu2.6
    • 7.4.3-4ubuntu2.7
    • 7.4.3-4ubuntu2.8
    Affected ranges
    • ECOSYSTEM: < 7.4.3-4ubuntu2.9

    Update to 7.4.3-4ubuntu2.9

  • php8.1 Ubuntu:22.04:LTS

    Versions
    • 8.1.0~rc4-1ubuntu2
    • 8.1.0-1
    Affected ranges
    • ECOSYSTEM: < 8.1.2-1ubuntu1

    Update to 8.1.2-1ubuntu1

Original sources

Check your server →