CVE-2020-7065

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

At a glance

Severity: HIGH 7.4
EPSS: EPSS 4.88 % · percentile 92 (2026-10-27)
State: PUBLISHED
Published: 2020-04-01
Updated: 2024-09-17
Assigner: php
NVD status: Modified

Description

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H	php
CVSS 3.1	HIGH 7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H	NVD · security@php.net (Secondary)
CVSS 3.1	HIGH 8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

ENISA EUVD · EUVD-2020-28199
GCVE · GCVE-0-2020-7065

CERT-FR advisories

CERTFR-2021-AVI-571 — Multiples vulnérabilités dans Tenable · cert.ssi.gouv.fr
CERTFR-2020-AVI-164 — Multiples vulnérabilités dans PHP · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 7.3.0 < 7.3.16
cpe:2.3:a:php:php:*:*:*:*:*:*:*:* ≥ 7.4.0 < 7.4.4
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:* < 5.19.0

Affected products

Product	Versions
PHP Group · PHP	affected 7.3.x < 7.3.16 ; affected 7.4.x < 7.4.4

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD