High severity8.2NVD Advisory· Published Feb 27, 2022· Updated Jun 17, 2026
CVE-2021-21708
CVE-2021-21708
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
71- osv-coords69 versionspkg:bitnami/libphppkg:bitnami/phppkg:bitnami/php-minpkg:rpm/almalinux/apcu-panelpkg:rpm/almalinux/libzippkg:rpm/almalinux/libzip-develpkg:rpm/almalinux/libzip-toolspkg:rpm/almalinux/phppkg:rpm/almalinux/php-bcmathpkg:rpm/almalinux/php-clipkg:rpm/almalinux/php-commonpkg:rpm/almalinux/php-dbapkg:rpm/almalinux/php-dbgpkg:rpm/almalinux/php-develpkg:rpm/almalinux/php-embeddedpkg:rpm/almalinux/php-enchantpkg:rpm/almalinux/php-ffipkg:rpm/almalinux/php-fpmpkg:rpm/almalinux/php-gdpkg:rpm/almalinux/php-gmppkg:rpm/almalinux/php-intlpkg:rpm/almalinux/php-jsonpkg:rpm/almalinux/php-ldappkg:rpm/almalinux/php-mbstringpkg:rpm/almalinux/php-mysqlndpkg:rpm/almalinux/php-odbcpkg:rpm/almalinux/php-opcachepkg:rpm/almalinux/php-pdopkg:rpm/almalinux/php-pearpkg:rpm/almalinux/php-pecl-apcupkg:rpm/almalinux/php-pecl-apcu-develpkg:rpm/almalinux/php-pecl-rrdpkg:rpm/almalinux/php-pecl-xdebugpkg:rpm/almalinux/php-pecl-xdebug3pkg:rpm/almalinux/php-pecl-zippkg:rpm/almalinux/php-pgsqlpkg:rpm/almalinux/php-processpkg:rpm/almalinux/php-snmppkg:rpm/almalinux/php-soappkg:rpm/almalinux/php-xmlpkg:rpm/almalinux/php-xmlrpcpkg:rpm/opensuse/apache2-mod_php7&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php7&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/php7&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php7&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/php7-embed&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php7-fastcgi&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php7-fpm&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php7-test&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/php7-test&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php8&distro=openSUSE%20Tumbleweedpkg:rpm/suse/apache2-mod_php7&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP4pkg:rpm/suse/php74&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2012pkg:rpm/suse/php74&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/php7&distro=SUSE%20Enterprise%20Storage%207pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-ESPOSpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP2-LTSSpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP4pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP3pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP3pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-BCLpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP2-LTSSpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP2pkg:rpm/suse/php7&distro=SUSE%20Manager%20Proxy%204.1pkg:rpm/suse/php7&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.1pkg:rpm/suse/php7&distro=SUSE%20Manager%20Server%204.1pkg:rpm/suse/php7-embed&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP4pkg:rpm/suse/php7-fastcgi&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP4pkg:rpm/suse/php7-fpm&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Legacy%2015%20SP4
>= 7.4.0, < 7.4.28+ 68 more
- (no CPE)range: >= 7.4.0, < 7.4.28
- (no CPE)range: >= 7.4.0, < 7.4.28
- (no CPE)range: >= 7.4.0, < 7.4.28
- (no CPE)range: < 5.1.20-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 1.7.3-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 1.7.3-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 1.7.3-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 7.4.30-1.module_el8.7.0+3286+227f3cf0
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 1:1.10.13-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 5.1.20-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 5.1.20-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 2.0.3-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 2.9.5-1.module_el8.6.0+3239+bedf0508
- (no CPE)range: < 3.1.2-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 1.19.2-1.module_el8.6.0+2739+efabdb8f
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 8.0.20-2.module_el8.7.0+3286+6cee236e
- (no CPE)range: < 7.4.30-1.module_el8.7.0+3286+227f3cf0
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.28-1.1
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150400.4.13.2
- (no CPE)range: < 8.1.3-1.1
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.6-1.36.1
- (no CPE)range: < 7.4.6-1.36.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.33-150400.4.13.1
- (no CPE)range: < 7.4.33-150400.4.13.1
Patches
Vulnerability mechanics
References
3- bugs.php.net/bug.phpnvdExploitIssue TrackingPatchVendor Advisory
- security.gentoo.org/glsa/202209-20nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20220325-0004/nvdThird Party Advisory
News mentions
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