CVE-2021-21707
Special characters break path parsing in XML functions
02 Description
Special characters break path parsing in XML functions
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 25.31% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 97.9% of scored records. A rank, not a probability.
- NVD base score
- 5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-11-29 06:25Z4 YR AGO
- Last updated
- 2024-09-17 03:38Z2 YR AGO
- Reserved
- 2021-01-04
- Assigning CNA
- php
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.3)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weaknesses
- Data version
- 5.1
- Document digest
- a4a46dfed5f74682522e66ffb9ee1186afe5cee55d60c88d3b77919991db1245
05 Affected products
06 References
- bugs.php.nethttps://bugs.php.net/bug.php?id=79971
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20211223-0005/
- www.debian.orgDSA-5082https://www.debian.org/security/2022/dsa-5082
- www.tenable.comhttps://www.tenable.com/security/tns-2022-09
- lists.debian.org[debian-lts-announce] 20221215 [SECURITY] [DLA 3243-1] php7.3 security updatehttps://lists.debian.org/debian-lts-announce/2022/12/msg00030.html
07 Fixed in
AlmaLinux 8
- apcu-panel Fixed in 5.1.18-1.module_el8.6.0+2750+78feabcb
- libzip Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-devel Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-tools Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- php Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-bcmath Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-cli Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-common Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-dba Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-dbg Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-devel Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-embedded Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-enchant Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-ffi Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-fpm Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-gd Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-gmp Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-intl Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-json Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-ldap Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-mbstring Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-mysqlnd Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-odbc Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-opcache Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-pdo Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-pear Fixed in 1:1.10.13-1.module_el8.6.0+3268+b150a051
- php-pecl-apcu Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- Affected before 5.1.18-1.module_el8.6.0+3239+bedf0508
- php-pecl-apcu-devel Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- Affected before 5.1.18-1.module_el8.6.0+3239+bedf0508
- php-pecl-rrd Fixed
A version is affected if any line below covers it.
- Affected before 2.0.1-1.module_el8.6.0+2750+78feabcb
- Affected before 2.0.1-1.module_el8.6.0+3239+bedf0508
- php-pecl-xdebug Fixed
A version is affected if any line below covers it.
- Affected before 2.9.5-1.module_el8.6.0+2750+78feabcb
- Affected before 2.9.5-1.module_el8.6.0+3239+bedf0508
- php-pecl-zip Fixed
A version is affected if any line below covers it.
- Affected before 1.18.2-1.module_el8.6.0+2750+78feabcb
- Affected before 1.18.2-1.module_el8.6.0+3239+bedf0508
- php-pgsql Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-process Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-snmp Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-soap Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-xml Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-xmlrpc Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- php Fixed in 8.0.13-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- apcu-panel Fixed in 5.1.18-1.module_el8.6.0+2750+78feabcb
- libzip Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-devel Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- libzip-tools Fixed
A version is affected if any line below covers it.
- Affected before 1.6.1-1.module_el8.6.0+2750+78feabcb
- Affected before 1.6.1-1.module_el8.6.0+3239+bedf0508
- php Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-bcmath Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-cli Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-common Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-dba Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-dbg Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-devel Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-embedded Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-enchant Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-ffi Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-fpm Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-gd Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-gmp Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-intl Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-json Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-ldap Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-mbstring Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-mysqlnd Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-odbc Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-opcache Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-pdo Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-pear Fixed in 1:1.10.13-1.module_el8.6.0+3268+b150a051
- php-pecl-apcu Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- Affected before 5.1.18-1.module_el8.6.0+3239+bedf0508
- php-pecl-apcu-devel Fixed
A version is affected if any line below covers it.
- Affected before 5.1.18-1.module_el8.6.0+2750+78feabcb
- Affected before 5.1.18-1.module_el8.6.0+3239+bedf0508
- php-pecl-rrd Fixed
A version is affected if any line below covers it.
- Affected before 2.0.1-1.module_el8.6.0+2750+78feabcb
- Affected before 2.0.1-1.module_el8.6.0+3239+bedf0508
- php-pecl-xdebug Fixed
A version is affected if any line below covers it.
- Affected before 2.9.5-1.module_el8.6.0+2750+78feabcb
- Affected before 2.9.5-1.module_el8.6.0+3239+bedf0508
- php-pecl-zip Fixed
A version is affected if any line below covers it.
- Affected before 1.18.2-1.module_el8.6.0+2750+78feabcb
- Affected before 1.18.2-1.module_el8.6.0+3239+bedf0508
- php-pgsql Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-process Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-snmp Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-soap Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-xml Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
- php-xmlrpc Fixed in 7.4.30-1.module_el8.7.0+3286+227f3cf0
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 11
- php7.4 Fixed in 7.4.28-1+deb11u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- php7.2 Fixed in 7.2.24-0ubuntu0.18.04.11
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- php7.4 Fixed in 7.4.3-4ubuntu2.10
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- php5 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- php7.0 Fixed in 7.0.33-0ubuntu0.16.04.16+esm3Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.