TI-2021-03099 Aliases CVE-2021-4240 GHSA-97w9-gcc7-vr8g

phpservermon User.php generatePasswordResetToken predictable algorithm in random number generator

MEDIUM 57CWE-331Published 2022-11-15 · Updated 2025-04-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00887 59th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed phpservermon/phpservermon (Packagist): 3.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
unspecified	phpservermon	all versions	—	No fix listed	CNA
—	phpservermon/phpservermon (Packagist)	before 3.6.0	3.6.0	Patch available	GHSA-97w9-gcc7-vr8g

phpservermon Vendorunspecified Affected all versions Fixed in — No fix listed CNA
phpservermon/phpservermon (Packagist) Vendor— Affected before 3.6.0 Fixed in 3.6.0 Patch available GHSA-97w9-gcc7-vr8g

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:phpservermonitor:php_server_monitor:-:::::::*	not specified by NVD	Vulnerable	PHP Server Monitor

cpe:2.3:a:phpservermonitor:php_server_monitor:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·PHP Server Monitor

Remediation

Fix · GHSA-97w9-gcc7-vr8g phpservermon/phpservermon (Packagist) Fixed in 3.6.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2021-4240
2026-10-03 Alias added: GHSA-97w9-gcc7-vr8g

References

Other 2

TI-2021-03100 phpservermon User.php setUserLoggedIn predictable algorithm in random number generator CVSS 3.1MEDIUM 5.3
TI-2018-13402 PHP Server Monitor before 3.3.2 has CSRF, as demonstrated by a Delete action. CVSS 3.0MEDIUM 6.5
TI-2021-02976 CRLF Injection in phpservermon/phpservermon CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences