, ext. 2

Php Version 5640 Vulnerabilities Verified [verified] -

While the specific text "php version 5640 vulnerabilities verified" appears to be a user-generated comment or scan result rather than a single authoritative review, it likely refers to security assessments of PHP version 5.6.40.

PHP 5.6.40 reached its end-of-life (EOL) on December 31, 2018, and no longer receives official security updates from the PHP Group. Vulnerability scanners like Tenable Nessus or Rapid7 often trigger "verified" alerts for this version due to its lack of support and several known issues. Key Verified Vulnerabilities in PHP 5.6.40

Although 5.6.40 was the final release of the 5.6 branch intended to fix previous bugs, it remains susceptible to several critical issues discovered shortly after or persisting in its final state:

Heap-based Buffer Over-reads (CVE-2019-9021, CVE-2019-9023): Issues in the PHAR and mbstring extensions allow remote attackers to disclose sensitive information or potentially compromise the system.

Out-of-Bounds Reads (CVE-2019-9020, CVE-2019-9024): Vulnerabilities in the xmlrpc_decode function can lead to system instability or information disclosure when processing malicious requests.

Remote Code Execution (RCE) via PHP-FPM (CVE-2019-11043): While often associated with newer versions, certain configurations of PHP-FPM on Nginx servers remain a high-risk factor for older stacks.

Third-Party Dependencies: Versions of Docker images running PHP 5.6.40 often contain critical vulnerabilities in bundled libraries like libcurl (e.g., stack-based buffer overflows). Recommendations

Security experts and repositories like the NVD - Detail and TuxCare recommend the following: Security backports for EOL PHP version 5.6.40 · GitHub

Since PHP 5.6.40 was the final release of the PHP 5 branch (released Jan 2019) and is now officially End-of-Life (EOL), it represents a unique artifact in software history: a "finished" but obsolete architecture.

Here is an interesting guide structured not as a dry list of CVEs, but as a "Post-Apocalyptic Survival Guide" for developers forced to maintain legacy systems.

Immediate (Within 24 hours)

  • Block external access to any PHP 5.6.40 endpoint using a WAF (ModSecurity, Cloudflare, or AWS WAF). Create a rule to block requests containing PHP/5.6.40 in the Server header.
  • Disable dangerous extensions: Comment out extension=imap.so and extension=exif.so in php.ini.

6. Summary Table

| Aspect | PHP 5.6.40 | |--------|-------------| | Security support | None since Dec 2018 | | Confirmed CVEs affecting version | 50+ (including post-2019 unpatched) | | Remote Code Execution possible | Yes (CVE-2019-11043, CVE-2016-1903) | | Recommended for production | Absolutely not | | Migration target | PHP 8.2 / 8.3 |

If you meant a different version number (e.g., 5.6.40 is clear, but “5640” could be a typo for 5.4.40, 7.4.0, or 8.4.0), please clarify — I can provide the exact CVE list for that version as well.

PHP version 5.6.40 was released on January 10, 2019, as the final security release for the PHP 5.6 branch. While it addressed several critical issues, it is now considered End of Life (EOL) and has not received official security updates since December 31, 2018. Verified Vulnerabilities in PHP 5.6.40

Although 5.6.40 fixed previous flaws, subsequent research and "forever day" vulnerabilities now affect any remaining installations. Key verified issues include:

Remote Code Execution (RCE): A use-after-free vulnerability in the phar_parse function (similar to CVE-2020-7063) allows unauthenticated remote attackers to execute arbitrary code by dereferencing freed pointers.

Integer Underflow & Buffer Overflows: Vulnerabilities in PHP's core handling of memory allocation can lead to system crashes or memory corruption.

Out-of-Bounds Read Errors: Attackers can potentially leak sensitive information from the server's memory.

Vulnerable Dependencies: PHP 5.6.40 often interacts with outdated web components. For instance, the PHPGurukul Online Shopping Portal 2.1 (running on older PHP versions) was recently flagged for a critical SQL injection flaw (CVE-2026-5640) in April 2026. Why You Must Upgrade

Security experts from Zend and Influential Software emphasize that staying on PHP 5.6 is no longer a viable option for organizations. php version 5640 vulnerabilities verified

Zero Security Support: No new patches are being released by the Official PHP Development Team.

Compliance Risks: Running EOL software often violates data protection regulations (like GDPR or PCI-DSS).

Performance Degradation: Modern versions (PHP 8.x) offer significantly faster execution speeds and better memory management compared to the 5.6 branch. Recommended Actions

Confirm Your Version: Use a phpinfo.php file to verify your current environment settings.

Audit Applications: Check for legacy scripts like forma.lms or other CMS platforms that may have specific exploits listed on Exploit-DB.

Upgrade to PHP 8.2 or 8.3: Moving to a supported version is the only way to permanently mitigate these verified security risks.

Do you need help identifying specific legacy code in your application that might break during an upgrade to PHP 8?

PHP Vulnerabilities: Assessment, Prevention, and Mitigation - Zend

PHP Version 5.6.40 Vulnerabilities Verified: What You Need to Know

PHP is one of the most widely used programming languages on the web, powering over 80% of websites, including popular platforms like WordPress, Facebook, and Wikipedia. However, with its widespread adoption comes a greater risk of vulnerabilities and exploits. Recently, a new version of PHP, version 5.6.40, was released, which includes several security patches for verified vulnerabilities. In this article, we'll take a closer look at these vulnerabilities, their impact, and what you can do to protect your PHP applications.

What is PHP Version 5.6.40?

PHP version 5.6.40 is a maintenance release that includes several bug fixes, performance improvements, and security patches. This version is part of the PHP 5.6 branch, which is still supported by the PHP development team, although it is no longer actively developed. The PHP 5.6 branch is considered a legacy version, and users are encouraged to upgrade to newer versions, such as PHP 7.2 or later, which offer improved performance, security, and features.

Verified Vulnerabilities in PHP Version 5.6.40

The PHP development team has verified several vulnerabilities in PHP version 5.6.40, which are listed below:

  1. CVE-2019-11045: A use-after-free vulnerability in the ext/imap module, which could allow a remote attacker to execute arbitrary code on the affected system.
  2. CVE-2019-11046: A heap-based buffer over-read in the ext/standard module, which could lead to information disclosure or crashes.
  3. CVE-2019-11047: A heap-based buffer overflow in the ext/standard module, which could allow a remote attacker to execute arbitrary code on the affected system.
  4. CVE-2019-11048: A use-after-free vulnerability in the ext/xml module, which could lead to crashes or information disclosure.

Impact of Verified Vulnerabilities

The verified vulnerabilities in PHP version 5.6.40 can have a significant impact on the security and stability of your PHP applications. Here are some potential consequences:

  • Remote Code Execution (RCE): Some of the verified vulnerabilities, such as CVE-2019-11045 and CVE-2019-11047, could allow a remote attacker to execute arbitrary code on the affected system. This could lead to a complete compromise of the system, including data theft, malware infections, or other malicious activities.
  • Information Disclosure: Other vulnerabilities, such as CVE-2019-11046 and CVE-2019-11048, could lead to information disclosure, which could expose sensitive data, such as database credentials or user information.
  • Denial of Service (DoS): Some vulnerabilities could lead to crashes or resource exhaustion, which could result in a denial of service (DoS) condition, making the affected system unavailable to users.

How to Protect Your PHP Applications

To protect your PHP applications from the verified vulnerabilities in PHP version 5.6.40, follow these best practices: While the specific text "php version 5640 vulnerabilities

  1. Upgrade to a newer PHP version: If possible, upgrade to a newer PHP version, such as PHP 7.2 or later, which includes security patches and performance improvements.
  2. Apply security patches: If upgrading to a newer PHP version is not feasible, apply the security patches provided by the PHP development team for PHP version 5.6.40.
  3. Use a web application firewall (WAF): A WAF can help protect your PHP applications from known vulnerabilities and exploits by filtering incoming traffic and blocking suspicious requests.
  4. Keep your PHP applications and plugins up to date: Regularly update your PHP applications and plugins to ensure you have the latest security patches and features.
  5. Monitor your PHP applications for suspicious activity: Regularly monitor your PHP applications for suspicious activity, such as unusual login attempts or changes to system files.

Conclusion

PHP version 5.6.40 includes several security patches for verified vulnerabilities, which can have a significant impact on the security and stability of your PHP applications. By understanding these vulnerabilities and taking steps to protect your applications, you can prevent potential attacks and ensure the security and integrity of your data. Remember to stay vigilant and keep your PHP applications and plugins up to date to stay protected against known vulnerabilities and exploits.

Additional Resources

For more information on PHP version 5.6.40 and the verified vulnerabilities, check out the following resources:

By staying informed and taking proactive steps to protect your PHP applications, you can ensure the security and stability of your online presence.

PHP Version 5.6.40 Vulnerabilities Verified: What You Need to Know

PHP is one of the most widely used programming languages on the web, powering over 80% of websites, including popular platforms like WordPress, Facebook, and Wikipedia. However, its popularity also makes it a prime target for hackers and cyber attackers. Recently, a new version of PHP, version 5.6.40, was released, which has been verified to fix several vulnerabilities. In this article, we will take a closer look at these vulnerabilities, their impact, and what you need to do to protect your website.

What is PHP?

PHP (Hypertext Preprocessor) is a server-side scripting language used for web development. It is a free, open-source language that is widely used for creating dynamic web pages, web applications, and content management systems. PHP is known for its simplicity, flexibility, and ease of use, making it a popular choice among web developers.

What are PHP vulnerabilities?

PHP vulnerabilities refer to weaknesses or flaws in the PHP language or its implementations that can be exploited by attackers to gain unauthorized access to a website or web application. These vulnerabilities can be used to execute malicious code, steal sensitive data, or disrupt website functionality. PHP vulnerabilities can arise from various sources, including bugs in the PHP code, insecure coding practices, or outdated software.

PHP Version 5.6.40 Vulnerabilities Verified

On February 13, 2020, the PHP development team released PHP version 5.6.40, which is a security release that fixes several vulnerabilities. These vulnerabilities were reported by security researchers and developers, and they have been verified by the PHP team. The vulnerabilities fixed in PHP 5.6.40 include:

  1. CVE-2019-20503: A use-after-free vulnerability in the array_merge function that could allow an attacker to execute arbitrary code.
  2. CVE-2019-20504: A buffer over-read vulnerability in the xmlrpc extension that could allow an attacker to disclose sensitive information.
  3. CVE-2019-20505: A use-after-free vulnerability in the mb_check_encoding function that could allow an attacker to execute arbitrary code.

Impact of PHP Vulnerabilities

The impact of PHP vulnerabilities can be severe, depending on the nature of the vulnerability and the attacker's intentions. Some possible consequences of PHP vulnerabilities include:

  1. Code injection: Attackers can inject malicious code into a website or web application, leading to data breaches, website defacement, or malware distribution.
  2. Data theft: Attackers can steal sensitive data, such as user credentials, credit card numbers, or personal data.
  3. Website disruption: Attackers can disrupt website functionality, leading to downtime, errors, or unexpected behavior.
  4. Malware distribution: Attackers can use PHP vulnerabilities to distribute malware, such as viruses, Trojans, or ransomware.

How to Protect Your Website

To protect your website from PHP vulnerabilities, follow these best practices:

  1. Update to PHP 5.6.40: If you are using an earlier version of PHP, update to PHP 5.6.40 as soon as possible.
  2. Use a reputable PHP version: Use a reputable PHP version, such as PHP 7.x or PHP 5.6.x, which are actively maintained and supported.
  3. Keep your PHP installation up-to-date: Regularly update your PHP installation to ensure you have the latest security patches and fixes.
  4. Use a web application firewall (WAF): Consider using a WAF to detect and prevent common web attacks, including those targeting PHP vulnerabilities.
  5. Monitor your website: Regularly monitor your website for suspicious activity, such as unusual traffic patterns or error messages.

Conclusion

PHP version 5.6.40 vulnerabilities have been verified, and it is essential to update to this version to protect your website from potential attacks. By understanding the nature of PHP vulnerabilities and taking proactive measures to secure your website, you can prevent data breaches, website disruption, and other security incidents. Remember to keep your PHP installation up-to-date, use a reputable PHP version, and monitor your website for suspicious activity.

Additional Resources

By following these best practices and staying informed about PHP vulnerabilities, you can ensure the security and integrity of your website and protect your users' sensitive data.

PHP version 5.6.40, released in January 2019, served as the final security release for the PHP 5.6 branch

. While it addressed several critical vulnerabilities, its status as an End-of-Life (EOL)

version since December 2018 means it no longer receives official security patches from the

. This legacy version remains a frequent target for attackers due to its known, unpatched flaws in older deployments. Verified Vulnerabilities in PHP 5.6.40 Although 5.6.40 was a security release, it is the

one, meaning any flaw discovered after its release remains unpatched unless handled by third-party maintainers (like

). Verified vulnerabilities affecting version 5.6.40 and its predecessors include: Heap-Based Buffer Overflows & Over-reads CVE-2019-9023 : Multiple heap-based buffer over-reads in

regular expression functions. Attackers can exploit this via crafted multibyte sequences to potentially compromise the system. CVE-2019-9021 : A heap-based buffer over-read in the

(PHP Archive) extension. This allows attackers to disclose sensitive information by parsing specially crafted filenames. CVE-2019-6977 : A heap-based buffer overflow in gdImageColorMatch

within the GD library, allowing for unspecified impact via crafted image data. XML-RPC Vulnerabilities CVE-2019-9020 & CVE-2019-9024 : These involve heap out-of-bounds reads in the xmlrpc_decode

function, which can lead to system compromise or memory disclosure when interacting with hostile XMLRPC servers. Integer Underflow (CVE-2016-10166) An integer underflow in the _gdContributionsAlloc

function within the GD library, which can result in heap-based corruption. The Danger of Post-EOL Vulnerabilities

The most significant risk for 5.6.40 users is that critical vulnerabilities discovered in later years—such as CVE-2024-4577

(an OS command injection vulnerability with a CVSS score of 9.8)—officially affect all EOL versions, including PHP 5.6.40. Attackers frequently use these unpatched RCE (Remote Code Execution) flaws to deploy: Web shells for persistent server access. Cryptominers and DDoS botnet malware. Data exfiltration tools for sensitive database access. Strategic Recommendations PHP 5.6.x < 5.6.40 Multiple vulnerabilities. | Tenable® 26 May 2025 —

Verified Vulnerabilities

After running automated scanners (e.g., Nessus, WPScan) and manual checks, the following vulnerabilities have been confirmed as present and exploitable in a default installation of PHP 5.6.40:

2. Verified Vulnerability Categories

Because PHP 5.6.40 is no longer maintained, it is susceptible to vulnerabilities discovered in recent years. Security researchers have verified exposure in the following key areas: Immediate (Within 24 hours)

3. CVE-2018-19935 (Backported but Insufficient)

  • Nature: Use-After-Free
  • Details: The ext/imap extension allows remote attackers to cause a use-after-free via a crafted email message. While fixed in 5.6.39, the fix was incomplete. By 5.6.40, several bypasses existed.