Home/CVE/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, c
CVE

CVE-2020-7065

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, c

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.

HIGH · CVSS 7.4 EPSS 0.04994
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

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

Affected Products & Versions

5
php>= 7.3.0 and < 7.3.16
php>= 7.4.0 and < 7.4.4
debian linuxall versions
canonical ubuntu linuxall versions
tenable tenable.sc< 5.19.0
⚠

Public Exploits & PoCs

1
pocbugs.php.net · bug.php?id=79371bugs.php.net
▣

Scoring & Timeline

7.4
HIGH · CVSS v3.1 · security@php.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Apr 2020 · 04:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
⚑

Vendor Advisories

5
rhsaRHSA-2020:3662Moderate
rhsaRHSA-2020:5275Moderate
usnUSN-4330-2
usnUSN-4330-1
cisa-csafcisa-csaf-csaf_files-OT-white-2026-icsa-26-027-02
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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-4719Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatchThird Party Advisory
https://www.php.net/ChangeLog-7.php#7.4.4Release NotesVendor Advisory
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