CVE-2021-36567

Name: CVE-2021-36567
Creator: NVD / NIST
Published: 2021-12-06T21:15:07.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.41%

Last modified Jun 17, 2026

CVE-2021-36567 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. ThinkPHP v6.0.8 was discovered to contain a deserialization vulnerability via the component League\Flysystem\Cached\Storage\AbstractCache.. EPSS estimates a 2.41% chance of exploitation in the next 30 days.

Description

ThinkPHP v6.0.8 was discovered to contain a deserialization vulnerability via the component League\Flysystem\Cached\Storage\AbstractCache.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.41%

82.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Thinkphp	Thinkphp	6.0.8

References

https://github.com/top-think/framework/issues/2561Exploit, Vendor Advisory
https://github.com/top-think/framework/issues/2561Exploit, Vendor Advisory

Timeline

Published: Dec 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36567?

ThinkPHP v6.0.8 was discovered to contain a deserialization vulnerability via the component League\Flysystem\Cached\Storage\AbstractCache.

How severe is CVE-2021-36567?

CVE-2021-36567 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.41% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36567?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36567?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST