UBUNTU-CVE-2021-21708

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2021-21708
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-21708.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-21708
Upstream
Downstream
Related
Published
2021-12-31T00:00:00Z
Modified
2025-09-08T16:46:57Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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 FILTERVALIDATEFLOAT 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 FILTERVALIDATEFLOAT with min/max limits.

References

Affected packages

Ubuntu:20.04:LTS / php7.4

Package

Name
php7.4
Purl
pkg:deb/ubuntu/php7.4@7.4.3-4ubuntu2.9?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
7.4.3-4ubuntu2.9

Affected versions

7.*

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libapache2-mod-php7.4",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "libphp7.4-embed",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-bcmath",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-bz2",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-cgi",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-cli",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-common",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-curl",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-dba",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-dev",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-enchant",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-fpm",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-gd",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-gmp",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-imap",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-interbase",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-intl",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-json",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-ldap",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-mbstring",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-mysql",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-odbc",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-opcache",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-pgsql",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-phpdbg",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-pspell",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-readline",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-snmp",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-soap",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-sqlite3",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-sybase",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-tidy",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-xml",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-xmlrpc",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-xsl",
            "binary_version": "7.4.3-4ubuntu2.9"
        },
        {
            "binary_name": "php7.4-zip",
            "binary_version": "7.4.3-4ubuntu2.9"
        }
    ]
}

Ubuntu:22.04:LTS / php8.1

Package

Name
php8.1
Purl
pkg:deb/ubuntu/php8.1@8.1.2-1ubuntu1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.1.2-1ubuntu1

Affected versions

8.*

8.1.0~rc4-1ubuntu2
8.1.0-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libapache2-mod-php8.1",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "libphp8.1-embed",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-bcmath",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-bz2",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-cgi",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-cli",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-common",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-curl",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-dba",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-dev",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-enchant",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-fpm",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-gd",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-gmp",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-imap",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-interbase",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-intl",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-ldap",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-mbstring",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-mysql",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-odbc",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-opcache",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-pgsql",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-phpdbg",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-pspell",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-readline",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-snmp",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-soap",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-sqlite3",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-sybase",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-tidy",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-xml",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-xsl",
            "binary_version": "8.1.2-1ubuntu1"
        },
        {
            "binary_name": "php8.1-zip",
            "binary_version": "8.1.2-1ubuntu1"
        }
    ]
}