Php Version - 5640 Vulnerabilities Link

Prior versions of PHP 5.6 up to 5.6.40 contain severe flaws. These issues allow unauthenticated attackers to trigger out-of-bounds reads, cause memory corruption, or execute code remotely. The official details can be tracked in the PHP 5 ChangeLog . 1. Multibyte String Vulnerabilities (mbstring)

Fixed CVE-2019-9021 , a heap buffer overflow found in the phar_detect_phar_fname_ext function.

The official U.S. government repository of standards-based vulnerability management data.

Attackers can read or write out-of-bounds heap data, resulting in application crashes or arbitrary remote code execution (RCE). Detailed tracking can be reviewed on the GitHub Advisory for CVE-2019-9023 . 2. XML-RPC Out-of-Bounds Read (CVE-2019-9020) php version 5640 vulnerabilities link

Never upgrade your live site directly. Set up a staging site that mimics your production environment.

Running legacy applications on PHP 5.6.40 poses immense enterprise security risks. Because it is unmaintained, newly discovered infrastructure flaws—such as the recent —can completely compromise servers running legacy PHP runtimes. Core Security Vulnerabilities in PHP 5.6.40

Released in January 2019, this version was the last gasp of the PHP 5 era. While it may keep your legacy code running, it represents a significant security liability. In this post, we break down the vulnerability landscape of PHP 5.6.40, where to find the data, and why you need an exit strategy immediately. Prior versions of PHP 5

| CVE ID | Description | CVSS | |--------|-------------|------| | | Remote code execution via env request variable (PHP-FPM) – unpatched in 5.6.40 | 9.8 (Critical) | | CVE-2019-9641 | Buffer overflow in php_url_parse_ex – DoS/RCE | 7.5 (High) | | CVE-2019-9020 | XML parsing vulnerability in libxml2 affecting PHP | 7.5 | | CVE-2018-20783 | Buffer over-read in php_escape_html_entities | 7.5 | | CVE-2016-10712 | Use-after-free in stream_get_filters | 7.5 |

Here is the official migration link from PHP.net:

If legacy business logic prevents an immediate upgrade, source security patches from reputable third-party vendors. If you see 5.6.40

If you can tell me what CMS (like WordPress) or framework (like Laravel) your site uses, I can provide a more specific checklist for your upgrade process. PHP 5.6: Why you should upgrade - Influential Software

| Action | Details | |--------|---------| | | Migrate to PHP 7.4 (EOL Nov 2022 – also not recommended) or PHP 8.1/8.2/8.3 (actively supported). | | Use a WAF | As a temporary mitigation, deploy a Web Application Firewall with virtual patches for known PHP 5.6 CVEs. | | Isolate | If impossible to upgrade, run the system in a completely isolated network with no public access. |

| CVE ID | Severity | Description | Link | |--------|----------|-------------|------| | | Critical (9.8) | Remote Code Execution via env_path_info under specific FPM configurations. | NVD Link | | CVE-2020-7063 | High (7.5) | File upload $_FILES array injection leading to denial of service. | NVD Link | | CVE-2020-7060 | High (7.5) | mb_strpos() & mb_strrpos() may cause a heap-use-after-free. | NVD Link | | CVE-2019-11046 | Medium (6.1) | bcmath function bypass of safe_bin checks. | NVD Link |

Run php -v today. If you see 5.6.40 , treat it as a critical incident. Your security audit links start here, but they must end with a migration plan.

Attackers can exploit flaws in older PHP versions to execute arbitrary code on the server, gaining full control over the website and underlying infrastructure.