CVE-2020-7065

Name: CVE-2020-7065
Creator: NVD / NIST
Published: 2020-04-01T04:15:13.943+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 4.74%

Last modified Jun 17, 2026

CVE-2020-7065 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 4.74% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

4.74%

90.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Php	Php	>= 7.3.0, < 7.3.16
Php	Php	>= 7.4.0, < 7.4.4
Debian	Debian Linux	10.0
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	19.10
Canonical	Ubuntu Linux	20.04
Tenable	Tenable.Sc	< 5.19.0

References

https://bugs.php.net/bug.php?id=79371Exploit, Issue Tracking, Patch, Vendor 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-4719Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
https://www.php.net/ChangeLog-7.php#7.4.4Release Notes, Vendor Advisory
https://www.tenable.com/security/tns-2021-14Third Party Advisory
https://bugs.php.net/bug.php?id=79371Exploit, Issue Tracking, Patch, Vendor 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-4719Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
https://www.php.net/ChangeLog-7.php#7.4.4Release Notes, Vendor Advisory
https://www.tenable.com/security/tns-2021-14Third Party Advisory

Timeline

Published: Apr 1, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-7065?

How severe is CVE-2020-7065?

CVE-2020-7065 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 4.74% probability of exploitation in the next 30 days.

How do I fix CVE-2020-7065?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-7065?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST