CVE-2021-36567: Deserialization of Untrusted Data in topthink/framework

topthink/framework Updated 02 Oct 2025

Summary

07/12/2021

Disclosed on

CVE-2021-36567

CVE

No i

Fix available

Critical

Severity

9.8

CVSS Score

CVE-2021-36567: Deserialization of Untrusted Data in topthink/framework. Affects topthink/framework versions < 6.0.8. No fix is published. How to fix ↓

Free scan

Check if this vulnerability affects your application

Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or Browse

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats

SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml

Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile

Javascript package-lock.json · yarn.lock · pnpm-lock.yaml

PHP composer.lock

Python poetry.lock · requirements.txt · Pipfile.lock

Go go.mod

Rust Cargo.lock

Ruby Gemfile.lock

Dart pubspec.lock

C/C++ conan.lock

Elixir mix.lock

Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Background

ThinkPHP is a popular PHP framework that provides a range of features and functionalities for web application development. It is widely used in the Packagist ecosystem. The vulnerability identified as CVE-2021-36567 affects ThinkPHP version 6.0.8. This vulnerability arises due to a deserialization flaw in the component League\Flysystem\Cached\Storage\AbstractCache.

Vulnerability Detail

The deserialization vulnerability in ThinkPHP v6.0.8 allows an attacker to exploit the deserialization of untrusted data, potentially leading to remote code execution. By leveraging this vulnerability, an attacker can execute arbitrary code on the affected system, compromising its integrity, confidentiality, and availability. The vulnerability has a CVSS score of 9.8, indicating its critical severity.

How To Fix

No fixed version is published for this vulnerability.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Workaround

As a workaround, users can implement input validation and sanitization techniques to mitigate the risk of deserialization attacks. By carefully validating and filtering user-supplied data, the impact of this vulnerability can be reduced. Here is an example of input validation using PHP's filter_var() function:

$input = $_POST['data'];

if (filter_var($input, FILTER_VALIDATE_INT)) {
    // Proceed with safe deserialization
} else {
    // Handle invalid input
}

Conclusion

The deserialization vulnerability in ThinkPHP v6.0.8 poses a significant risk to the security of web applications built on this framework. It is crucial for users to update their ThinkPHP installation to a version beyond 6.0.8 to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for topthink/framework →