Security restrictions bypass in PHP

Published: 2021-01-07 | Updated: 2021-01-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-7071
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Universal components / Libraries / Scripting languages

Vendor PHP Group

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated: 09.01.2021

Added version 8.0.0 to the list of affected software.

1) Input validation error

EUVDB-ID: #VU49338

Risk: Medium

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-7071

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No


The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of URL performed via the "FILTER_VALIDATE_URL" setting. A remote attacker can use the "@" characters in the URL to bypass implemented filter and force the application to accept arbitrary URL instead of the defined by the option.



Install updates from vendor's website.

Vulnerable software versions

PHP: 7.3 - 8.0.0

External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.