CVE-2020-7065 - CVE House
Back to Database
Status published High CVE-2020-7065

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

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2020-7065

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • anatoly dot trosinenko at gmail dot com

References

More from PHP Group

View All →
CVE-2025-6491
NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix
Medium 5.9
CVE-2025-1861
Stream HTTP wrapper truncates redirect location to 1024 bytes
Medium 6.3
CVE-2025-1736
Stream HTTP wrapper header check might omit basic auth header
Medium 6.3
CVE-2025-1735
pgsql extension does not check for errors during escaping
Medium 5.9
CVE-2025-1734
Streams HTTP wrapper does not fail for headers with invalid name and no colon
Medium 6.3

Affected Vendor

Affected Software

PHP
Vulnerable Versions:
7.3.x, 7.4.x

Timeline

Official Publish: April 1st, 2020
Last Modified: September 17th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Weaknesses (CWE)

CWE-121

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1055 Process Injection
Defense Evasion
T1105 Ingress Tool Transfer
Command and Control
T1485 Data Destruction
Impact