CVE-2021-37704

Name: CVE-2021-37704
Creator: NVD / NIST
Published: 2021-08-12T20:15:07.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 6.13%

Last modified Jun 17, 2026

CVE-2021-37704 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 6.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

6.13%

92.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Phpfastcache	Phpfastcache	< 6.1.5
Phpfastcache	Phpfastcache	>= 7.0.0, < 7.1.2
Phpfastcache	Phpfastcache	>= 8.0.0, < 8.0.7

References

https://github.com/PHPSocialNetwork/phpfastcache/blob/master/CHANGELOG.md#807Release Notes, Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/commit/41a77d0d8f126dbd6fbedcd9e6a82e86cdaafa51Patch, Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/pull/813Patch, Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/pull/814Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/pull/815Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/security/advisories/GHSA-cvh5-p6r6-g2qcThird Party Advisory
https://github.com/flextype/flextype/issues/567Exploit, Issue Tracking, Third Party Advisory
https://packagist.org/packages/phpfastcache/phpfastcacheProduct, Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/blob/master/CHANGELOG.md#807Release Notes, Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/commit/41a77d0d8f126dbd6fbedcd9e6a82e86cdaafa51Patch, Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/pull/813Patch, Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/pull/814Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/pull/815Third Party Advisory
https://github.com/PHPSocialNetwork/phpfastcache/security/advisories/GHSA-cvh5-p6r6-g2qcThird Party Advisory
https://github.com/flextype/flextype/issues/567Exploit, Issue Tracking, Third Party Advisory
https://packagist.org/packages/phpfastcache/phpfastcacheProduct, Third Party Advisory

Timeline

Published: Aug 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37704?

How severe is CVE-2021-37704?

CVE-2021-37704 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 6.13% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37704?

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-2021-37704?

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

Scan your code now

Source: NVD / NIST