CVE-2021-4240

Name: CVE-2021-4240
Creator: NVD / NIST
Published: 2022-11-15T23:15:10.233+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.80%

Last modified Jun 17, 2026

CVE-2021-4240 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A vulnerability, which was classified as problematic, was found in phpservermon. This affects the function generatePasswordResetToken of the file src/psm/Service/User.php. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

Description

A vulnerability, which was classified as problematic, was found in phpservermon. This affects the function generatePasswordResetToken of the file src/psm/Service/User.php. The manipulation leads to use of predictable algorithm in random number generator. The exploit has been disclosed to the public and may be used. The name of the patch is 3daa804d5f56c55b3ae13bfac368bb84ec632193. It is recommended to apply a patch to fix this issue. The identifier VDB-213717 was assigned to this vulnerability.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.80%

52.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Phpservermonitor	Php Server Monitor	All versions

References

https://github.com/phpservermon/phpservermon/commit/3daa804d5f56c55b3ae13bfac368bb84ec632193Patch, Third Party Advisory
https://huntr.dev/bounties/2-phpservermon/phpservermon/Exploit, Patch, Third Party Advisory
https://vuldb.com/?id.213717Third Party Advisory
https://github.com/phpservermon/phpservermon/commit/3daa804d5f56c55b3ae13bfac368bb84ec632193Patch, Third Party Advisory
https://huntr.dev/bounties/2-phpservermon/phpservermon/Exploit, Patch, Third Party Advisory
https://vuldb.com/?id.213717Third Party Advisory

Timeline

Published: Nov 15, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4240?

How severe is CVE-2021-4240?

CVE-2021-4240 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4240?

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-2021-4240?

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

Scan your code now

Source: NVD / NIST