CVE-2021-37704Exposed phpinfo() in PhpFastCache
- 5.4MediumCVSS base score
- 5.1%Exploitation in 30 daysEPSS · top 7.5% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Nuclei template for it.
Show the exploits1
Nuclei templates1 template
- phpfastcache - phpinfo Resource Exposure (Nuclei template) (opens in a new tab)
http/cves/2021/CVE-2021-37704.yamlSeverity medium
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By GitHub_M
- 14 days later
· 14 days later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
- EPSS (exploitation in 30 days)
- 5.1% · top 7.5% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.
Affected products
PHPSocialNetwork · phpfastcache
- affected < 6.1.5
- affected >= 7.0.0, < 7.1.2
- affected >= 8.0.0, < 8.0.7
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistphpfastcache/phpfastcacheGHSA-cvh5-p6r6-g2qc (opens in a new tab)
References
References8
- https://github.com/PHPSocialNetwork/phpfastcache/security/advisories/GHSA-cvh5-p6r6-g2qc (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/flextype/flextype/issues/567 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/PHPSocialNetwork/phpfastcache/pull/813 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/PHPSocialNetwork/phpfastcache/pull/814 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/PHPSocialNetwork/phpfastcache/pull/815 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/PHPSocialNetwork/phpfastcache/commit/41a77d0d8f126dbd6fbedcd9e6a82e86cdaafa51 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/PHPSocialNetwork/phpfastcache/blob/master/CHANGELOG.md#807 (opens in a new tab)x_refsource_MISCx_transferred
- https://packagist.org/packages/phpfastcache/phpfastcache (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-1686 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-cvh5-p6r6-g2qc (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-37704)Record last updated .