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CVE-2021-37704— Exposed phpinfo() in PhpFastCache

Quick assessment

Affected
PHPSocialNetwork phpfastcache
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

phpfastcache是一套后端缓存系统。 PhpFastCache存在信息泄露漏洞，该漏洞源于软件对于"vendor"目录缺乏有效的访问保护，导致攻击者可以访问"phpinfo()"。

CVSS 5.4 · Medium EPSS 5.89% · P93

Public Exploits 1

Nuclei · 1 CVE-2021-37704.yaml [template]
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I. Basic Information for CVE-2021-37704

Vulnerability Information
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Vulnerability Title
Exposed phpinfo() in PhpFastCache
Source: CVE Program / CVE List V5
Vulnerability Description
PhpFastCache is a high-performance backend cache system (packagist package phpfastcache/phpfastcache). In versions before 6.1.5, 7.1.2, and 8.0.7 the `phpinfo()` can be exposed if the `/vendor` is not protected from public access. This is a rare situation today since the vendor directory is often located outside the web directory or protected via server rule (.htaccess, etc). Only the v6, v7 and v8 will be patched respectively in 8.0.7, 7.1.2, 6.1.5. Older versions such as v5, v4 are not longer supported and will **NOT** be patched. As a workaround, protect the `/vendor` directory from public access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
phpfastcache 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
phpfastcache是一套后端缓存系统。 PhpFastCache存在信息泄露漏洞，该漏洞源于软件对于"vendor"目录缺乏有效的访问保护，导致攻击者可以访问"phpinfo()"。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHPSocialNetwork phpfastcache < 6.1.5 -

II. Public POCs for CVE-2021-37704

# POC Description Source Link Shenlong Link
1 phpinfo() is susceptible to resource exposure in unprotected composer vendor folders via phpfastcache/phpfastcache. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-37704.yaml POC Details
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III. Intelligence Information for CVE-2021-37704

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Patches & Fixes for CVE-2021-37704 (4)

Vendor Advisories for CVE-2021-37704 (1)

Other References for CVE-2021-37704 (3)

IV. Related Vulnerabilities

Same product: phpfastcache
Same vendor: PHPSocialNetwork
Same weakness: CWE-200

V. Comments for CVE-2021-37704

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