high 7.4

CVE-2020-7065 json

mb_strtolower (UTF-32LE): stack-buffer-overflow at php_unicode_tolower_full

published 2020-04-01 6 y ago modified 2026-09-08 2 mo ago also BIT-libphp-2020-7065 , BIT-php-2020-7065 , BIT-php-min-2020-7065 , EUVD-2020-28199

cvss: 7.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 4.9%; EPSS 4.9% chance of exploitation in 30 days, percentile 92%
public exploits: 0; none known

In PHP versions 7.3.x below 7.3.16 and 7.4.x below 7.4.4, while using mb_strtolower() function with UTF-32LE encoding, certain invalid strings could cause PHP to overwrite stack-allocated buffer. This could lead to memory corruption, crashes and potentially code execution.

Patch / fix

fixed in 4 distros 6 links 2

bitnami libphp 7.3.16, 7.4.4
bitnami php 7.3.16, 7.4.4
bitnami php-min 7.3.16, 7.4.4
PHP Group PHP 7.3.16, 7.4.4

debian ubuntu red hat almalinux rocky linux alpine

php7.4 Debian 11 7.4.5-1

debian advisories DEBIAN-CVE-2020-7065

php7.4 Ubuntu 20.04 LTS 7.4.3-4ubuntu1.1

ubuntu advisories UBUNTU-CVE-2020-7065

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

php RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
libzip RHEL 8 1.5.2-1.module+el8.1.0+3189+a1bff096
php-gd RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
php-cli RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
php-dba RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
php-dbg RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
php-fpm RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef
php-gmp RHEL 8 7.3.20-1.module+el8.2.0+7373+b272fdef

red hat advisories RHSA-2020:3662 RHSA-2020:5275

php AlmaLinux 8 7.3.20-1.module_el8.4.0+2229+b272fdef
php AlmaLinux 8 7.3.20-1.module_el8.5.0+152+112d3b8c
php AlmaLinux 8 7.3.20-1.module_el8.3.0+2009+b272fdef
libzip AlmaLinux 8 1.5.2-1.module_el8.5.0+152+112d3b8c
libzip AlmaLinux 8 1.5.2-1.module_el8.3.0+2009+b272fdef
libzip AlmaLinux 8 1.5.2-1.module_el8.4.0+2229+b272fdef
php-gd AlmaLinux 8 7.3.20-1.module_el8.4.0+2229+b272fdef
php-gd AlmaLinux 8 7.3.20-1.module_el8.3.0+2009+b272fdef

almalinux advisories ALSA-2020:3662

php Rocky Linux 8 7.3.20-1.module+el8.4.0+414+2e7afcdd
libzip Rocky Linux 8 1.5.2-1.module+el8.4.0+414+2e7afcdd
php-pear Rocky Linux 8 1:1.10.9-1.module+el8.4.0+414+2e7afcdd
php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.4.0+414+2e7afcdd
php-pecl-zip Rocky Linux 8 1.15.4-1.module+el8.4.0+414+2e7afcdd
php-pecl-apcu Rocky Linux 8 5.1.17-1.module+el8.4.0+414+2e7afcdd
php-pecl-xdebug Rocky Linux 8 2.8.0-1.module+el8.4.0+414+2e7afcdd

rocky linux advisories RLSA-2020:3662

php7 Alpine 3.15, Alpine 3.14, Alpine 3.13 +2 more 7.3.16-r0

alpine advisories ALPINE-CVE-2020-7065

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

oracle.com/security-alerts/cpuoct2021.html advisory
bugs.php.net/bug.php?id=79371 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-7065 updated 2026-11-05 cvss 8.8

php: Using mb_strtolower() function with UTF-32LE encoding leads to potential code execution

Red Hat Enterprise Linux AppStream (v. 8) php 7.3.20-1.module+el8.2.0+7373+b272fdef, libzip 1.5.2-1.module+el8.1.0+3189+a1bff096, php-gd 7.3.20-1.module+el8.2.0+7373+b272fdef, php-cli 7.3.20-1.module+el8.2.0+7373+b272fdef, php-dba 7.3.20-1.module+el8.2.0+7373+b272fdef, php-dbg 7.3.20-1.module+el8.2.0+7373+b272fdef, +28 more
fixed: vendor fix RHSA-2020:3662
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-php73-php 7.3.20-1.el7, rh-php73-php-gd 7.3.20-1.el7, rh-php73-php-cli 7.3.20-1.el7, rh-php73-php-dba 7.3.20-1.el7, rh-php73-php-dbg 7.3.20-1.el7, rh-php73-php-fpm 7.3.20-1.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-php73-php 7.3.20-1.el7, rh-php73-php-gd 7.3.20-1.el7, rh-php73-php-cli 7.3.20-1.el7, rh-php73-php-dba 7.3.20-1.el7, rh-php73-php-dbg 7.3.20-1.el7, rh-php73-php-fpm 7.3.20-1.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-php73-php 7.3.20-1.el7, rh-php73-php-gd 7.3.20-1.el7, rh-php73-php-cli 7.3.20-1.el7, rh-php73-php-dba 7.3.20-1.el7, rh-php73-php-dbg 7.3.20-1.el7, rh-php73-php-fpm 7.3.20-1.el7, +22 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-php73-php 7.3.20-1.el7, rh-php73-php-gd 7.3.20-1.el7, rh-php73-php-cli 7.3.20-1.el7, rh-php73-php-dba 7.3.20-1.el7, rh-php73-php-dbg 7.3.20-1.el7, rh-php73-php-fpm 7.3.20-1.el7, +22 more
fixed: vendor fix RHSA-2020:5275
Red Hat Enterprise Linux 5 php, php53 Red Hat Enterprise Linux 6 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +20 more Red Hat Enterprise Linux 7 php, php-gd, php-cli, php-dba, php-fpm, php-pdo, +18 more Red Hat Enterprise Linux 8 php, libzip, php-gd, php-cli, php-dba, php-dbg, +30 more Red Hat Software Collections rh-php72-php, rh-php72-php-gd, rh-php72-php-cli, rh-php72-php-dba, rh-php72-php-dbg, rh-php72-php-fpm, +22 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-027-02 updated 2026-01-27 cvss 8.8

Festo Didactic SE MES PC

Festo Didactic SE MES PC shipped_with_Windows_10
affected: vendor fix

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

4.87% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

bugs.php.net https://bugs.php.net/bug.php?id=79371 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P
OSV	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
bitnami	libphp	>=7.3.0, <7.3.16 >=7.4.0, <7.4.4	7.3.16 7.4.4
bitnami	php	>=7.3.0, <7.3.16 >=7.4.0, <7.4.4	7.3.16 7.4.4
bitnami	php-min	>=7.3.0, <7.3.16 >=7.4.0, <7.4.4	7.3.16 7.4.4

Affected products

PHP Group PHP

Classification

Weakness

CWE-121 Stack-based Buffer Overflow
CWE-787 Out-of-bounds Write

Technology feeds

PHP rss critical rss

References

oracle.com /security-alerts/cpuoct2021.html
patch, third-party-advisory, advisory
bugs.php.net /bug.php?id=79371
exploit, issue-tracking, patch, vendor-advisory, advisory
usn.ubuntu.com /4330-1/
vendor-advisory, third-party-advisory, advisory
usn.ubuntu.com /4330-2/
vendor-advisory, third-party-advisory, advisory
debian.org /security/2020/dsa-4719
vendor-advisory, third-party-advisory, advisory
php.net /ChangeLog-7.php#7.4.4
release-notes, vendor-advisory, advisory
security.netapp.com /advisory/ntap-20200403-0001/
third-party-advisory, advisory
tenable.com /security/tns-2021-14
third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2020-7065
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary