High severity7.8NVD Advisory· Published Oct 25, 2021· Updated Jun 17, 2026
CVE-2021-21703
CVE-2021-21703
Description
In PHP versions 7.3.x up to and including 7.3.31, 7.4.x below 7.4.25 and 8.0.x below 8.0.12, when running PHP FPM SAPI with main FPM daemon process running as root and child worker processes running as lower-privileged users, it is possible for the child processes to access memory shared with the main process and write to it, modifying it in a way that would cause the root process to conduct invalid memory reads and writes, which can be used to escalate privileges from local unprivileged user to the root user.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
98- cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:communications_diameter_signaling_router:*:*:*:*:*:*:*:*Range: >=8.0.0.0,<=8.5.0.2
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- osv-coords86 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-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_php8&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php7&distro=openSUSE%20Leap%2015.2pkg: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-test&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/php7-test&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/php8&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php8&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/php8-embed&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php8-fastcgi&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php8-fpm&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/php8-test&distro=openSUSE%20Leap%2015.4pkg:rpm/suse/apache2-mod_php8&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP4pkg:rpm/suse/php7&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/php7&distro=SUSE%20Enterprise%20Storage%207pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg: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%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP2pkg: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%20SP2pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP3pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg: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%2015-LTSSpkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/php7&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg: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/php72&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2012pkg:rpm/suse/php72&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg: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/php8&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP4pkg:rpm/suse/php8-embed&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP4pkg:rpm/suse/php8-fastcgi&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP4pkg:rpm/suse/php8-fpm&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP4pkg:rpm/suse/php8-test&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Web%20and%20Scripting%2015%20SP4
>= 7.3.0, < 7.3.32+ 85 more
- (no CPE)range: >= 7.3.0, < 7.3.32
- (no CPE)range: >= 7.3.0, < 7.3.32
- (no CPE)range: >= 7.3.0, < 7.3.32
- (no CPE)range: < 5.1.18-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 1.6.1-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 1.6.1-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 1.6.1-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 1:1.10.12-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 5.1.18-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 5.1.18-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 2.0.1-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 2.9.5-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 1.18.2-1.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 7.4.19-2.module_el8.6.0+2750+78feabcb
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 7.4.6-lp152.2.21.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.4.25-1.1
- (no CPE)range: < 7.4.6-lp152.2.21.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.12-1.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.4.6-3.29.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.6-3.29.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.4.33-150200.3.46.2
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.2.34-150000.4.103.1
- (no CPE)range: < 7.2.34-150000.4.103.1
- (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: < 7.2.5-1.72.1
- (no CPE)range: < 7.2.5-1.72.1
- (no CPE)range: < 7.4.6-1.27.1
- (no CPE)range: < 7.4.6-1.27.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
- (no CPE)range: < 8.0.24-150400.4.14.1
Patches
Vulnerability mechanics
References
12- www.openwall.com/lists/oss-security/2021/10/26/7nvdMailing ListPatchThird Party Advisory
- www.oracle.com/security-alerts/cpuapr2022.htmlnvdPatchVendor Advisory
- www.oracle.com/security-alerts/cpujan2022.htmlnvdPatchVendor Advisory
- bugs.php.net/bug.phpnvdExploitIssue TrackingPatchVendor Advisory
- lists.debian.org/debian-lts-announce/2021/10/msg00021.htmlnvdMailing ListThird Party Advisory
- security.gentoo.org/glsa/202209-20nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20211118-0003/nvdThird Party Advisory
- www.debian.org/security/2021/dsa-4992nvdThird Party Advisory
- www.debian.org/security/2021/dsa-4993nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6PZVLICZUJMXOGWOUWSBAEGIVTF6Y6V3/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JO5RA6YOBGGGKLIA6F6BQRZDDECF5L3R/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PBM3KKB3RY2YPOKNMC4HIH7IH3T3WC74/nvd
News mentions
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