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Vulnerability record · CVE-2020-7065 · published 1 April 2020

CVE-2020-7065: Php stack-based buffer overflow vulnerability

Php · Php

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.

8.8 CVSS 3.1 High EPSS 4.9% · top 8.2% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write
8.8CVSS 3.1 base score, v2 6.8
4.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
16References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.php.net/bug.php?id=79371 ExploitIssue TrackingPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20200403-0001/ Third Party Advisory
https://usn.ubuntu.com/4330-1/ Third Party Advisory
https://usn.ubuntu.com/4330-2/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4719 Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://www.php.net/ChangeLog-7.php#7.4.4 Release NotesVendor Advisory
https://www.tenable.com/security/tns-2021-14 Third Party Advisory
https://bugs.php.net/bug.php?id=79371 ExploitIssue TrackingPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20200403-0001/ Third Party Advisory
https://usn.ubuntu.com/4330-1/ Third Party Advisory
https://usn.ubuntu.com/4330-2/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4719 Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
https://www.php.net/ChangeLog-7.php#7.4.4 Release NotesVendor Advisory
https://www.tenable.com/security/tns-2021-14 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-7065), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.