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CVE-2021-36567

32
FAUCET Score

CVE-2021-36567 is a critical deserialization vulnerability affecting ThinkPHP v6.0.8, specifically within the League\Flysystem\Cached\Storage\AbstractCache component. With a CVSS score of 9.8, it allows unauthenticated attackers to achieve complete compromise (confidentiality, integrity, availability) with low attack complexity over the network. While there are no known active exploits or public exploit frameworks like Metasploit, the vulnerability has garnered significant community discussion, indicating potential interest in developing exploits.

Impacted Technologies

VendorProductVersion(s)CPE
6.0.8CPE matchmatch criteria
cpe:2.3:a:thinkphp:thinkphp:6.0.8:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.41%
Probability of exploitation in next 30 days
EPSS Percentile
82.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0241 is in the 72nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-qrvj-274h-hfcgcritical

Deserialization of Untrusted Data in topthink/framework

Dec 7, 2021

References

github.com / top-think/framework/issues/2561
ExploitVendor Advisory