CVE-2020-7065Public exploitNetwork attack vector

Memory corruption via UTF-32LE stack buffer overwrite

Published Apr 1, 2020 · Updated Sep 17, 2024

Stack-based buffer overflow in PHP 7.3 before 7.3.16 and 7.4 before 7.4.4 allows attackers to corrupt memory via invalid UTF-32LE input. In mb_strtolower(), php_unicode_tolower_full copies an oversized case-conversion result from read-only data into a stack buffer without validating the destination bound. Reachability requires mbstring code to pass crafted UTF-32LE text to mb_strtolower(); the demonstrated outcome is a process crash, while the CNA also records potential code execution.

CVSS severity7.4
High
EPSS probability4.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in PHP 7.3 before 7.3.16 and 7.4 before 7.4.4 allows attackers to corrupt memory via invalid UTF-32LE input. In mb_strtolower(), php_unicode_tolower_full copies an oversized case-conversion result from read-only data into a stack buffer without validating the destination bound. Reachability requires mbstring code to pass crafted UTF-32LE text to mb_strtolower(); the demonstrated outcome is a process crash, while the CNA also records potential code execution.

The record

CVE
CVE-2020-7065
Published
Apr 1, 2020
Updated
Sep 17, 2024
Vendor
The PHP Group
Product
PHP
Classifications
CWE-121, CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.3.x <7.3.16
  2. Affected versionversion=7.4.x <7.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The PHP Group · PHPversion=7.3.x <7.3.16; version=7.4.x <7.4.4

Published CVSS scores

7.4PHP GroupCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
6.8NIST National Vulnerability DatabaseAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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